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10th science assignment question paper ,answer key, 10th science tn scert unit 1 answers, assignment.

Subject: Science | Physics
UNIT-1 Laws of motion

I. Choose the correct answer

Part – b.

II. Short Answer

The inherent property of a body to resist any change in its state of rest or the state of uniform motion, unless it is influenced upon by an external unbalanced force, is known as ‘inertia’.
Inertia of rest
Inertia of motion
Inertia of direction

13. State Newton’s second law.

The force acting on a body is directly proportional to the rate of change of linear momentum of the body and the change in momentum takes place in the direction of the force.

Part – C

Iii. write in detail.

Inertia of rest: The resistance of a body to change its state of rest is called inertia of rest.
The resistance of a body to change its state of motion is called inertia of motion.
Inertia of direction: The resistance of a body to change its direction of motion is called inertia of direction.
Subject: Science | Chemistry
UNIT-7 Atoms and Molecules

I. Choose the correct answer

Ii. short answer..

Relative atomic mass of an element is the ratio between the average mass of its isotopes to \( '\frac{1}{12^{th}}\' )part of the mass of a carbon-12 atom. It is denoted as Ar.
HI, HCl, CO, HBr, HF.
The salient features of “Modem atomic theory” are,
An atom is no longer indivisible.
Atoms of the same element may have different atomic mass.
Atoms of different elements may have the same atomic masses.
Atoms of one element can be transmuted into atoms of other elements. In other words, an atom is no longer indestructible.
Atoms may not always combine in a simple whole-number ratio.
Atom is the smallest particle that takes part in a chemical reaction.
The mass of an atom can be converted into energy [E = mc2].iving a car, you tend to lean sidewa.

10th Science TN SCERT Unit 12 Answers

UNIT 12 - Plant Anatomy and Plant Physiology

Biology UNIT-12 Plant Anatomy and Plant Physiology

Part – a.

1. Who is the father of plant anatomy?

a) Sachs

b) Nehemiah Grew

c) Melvin Calvin

d) C.N.R.Rao

2. The group of cells which are similar or dissimilar in structure and origin that perform similar function is called

a) Organ System

b) Vascular Bundles

c) Tissues

d) Pericycle

3. The pores present in Epidermis are called

a) Stomata

b) Cuticle

c) Trichome

4. Xylem and Phloem are present in different radii of ----------

a) root

b) stem

c) leaf

5. If xylem and phloem lie on the same radii that vascular bundle is --------------

a) radial bundle

b) conjoint bundle

c) concentric and amphivasal

d) amphicribral

11.What are tissues?

12.Classify the types of plant tissues.

Epidermis protects the inner tissues.
Stomata helps in transpiration.
Root hairs help in absorption of water and minerals.

13.What are the functions of Dermal or Epidremal tissue system?

The outer most covering layer of plants.
It contains epidermis, stomata and epidermal out growths.
Epidermis are interrupted by many minute pores called stomata.
Epidermis is covered by cuticle to check evaporation of water.
Trichomes and root hairs are some epidermal growths.

III. Write In detail

16.a)Differentiate the following

Monocot root and Dicot root

b) Draw a neat labelled diagram of Radial vascular bundle

17.a) Write the components and functions of plant tissue system.

b) Classify the tissues based on their ability to divide

(Inertia of direction).

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NCERT Solutions for Class 10 Science Free PDF Download

Ncert solutions for class 10 science – physics, chemistry, biology.

Science has its own history of completely transforming the entire world that we live in. Since ancient times, it’s been proved several times that Science has the capacity to revolutionize the phases of Mankind. Science is a combination of theoretical and practical knowledge and can be one of the toughest subjects to understand. In the CBSE Class 10 Science, there are crucial topics such as electricity, magnetic effects of electric current, refraction of light, etc for this we provide you NCERT Solutions for Class 10 Science.

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Chapter 1 – Chemical Reactions and Equations
Chapter 2 – Acids, Bases, and Salts
Chapter 3 – Metals and Non-Metals
Chapter 4 – Carbon and Its Compounds
Chapter 5 – Periodic Classification of Elements
Chapter 6 – Life Processes
Chapter 7 – Control and Coordination
Chapter 8 – How Do Organisms Reproduce
Chapter 9 – Heredity and Evolution
Chapter 10 – Light reflection and refraction
Chapter 11 – Human eye and colorful world
Chapter 12 – Electricity
Chapter 13 – Magnetic effect of electric current
Chapter 14 – Sources of energy
Chapter 15 – Our Environment
Chapter 16 – Management of Natural Resources

CBSE Class 10 Science Chapter-wise NCERT Solutions

Ncert solutions for class 10 science chapter 1 – chemical reactions and equations.

In this chapter, you learn the way of writing chemical equations and balance them, types of chemical reactions, combination reaction, displacement reaction, double displacement reaction, effects of oxidation reactions, corrosion, rancidity.

NCERT Solutions for Class 10 Science Chapter 2 – Acid Bases and Salt

In this chapter you will deal with the concepts of acid, bases, and salts , different types of chemical reactions and the reaction of acid, bases, and salts with certain compounds, chemical properties of bases and acids, neutralization reaction, pH scale, importance of pH, reaction of metallic oxides, reaction of non – metallic oxide, and pH of salts .

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In this chapter you will learn about the covalent bond in carbon, compounds derived from carbon, its versatile nature, chemical properties of carbon, properties of Ethanol and Ethanoic acid, soaps and detergents and their cleansing actions.

NCERT Solutions for Class 10 Science Chapter 5 – Periodic Classification of Elements

In this chapter, you will learn the arrangement of elements into the periodic table, classification of elements, Dobereiner’s triads, Newland’s law of Octaves, Mendeleev’s periodic table, the modern periodic table, metallic and non- metallic properties of elements.

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In this chapter, you will learn about the processes of nutrition, transpiration, respiration, and excretion in plants, in animals and in humans.

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In this chapter, you will study some topics in details such as the nervous system of human beings, explanation about the anatomy of the Human Brain, coordination in plant and hormones in animals.

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In this chapter, you will learn about the process of reproduction for unicellular organisms and multicellular organisms, asexual and sexual modes of reproduction, the reproductive systems of both animals and plants.

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In this chapter, you will learn about the process of passing of genes from one generation to another, blood group formation by genes, sex determination, evolution in detail, Charles Darwin’s theory.

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In this chapter, you will get to know the phenomena of reflection of plane and curved surfaces and bending at the interface of two mediums with different properties , laws of reflection and refraction , images formed by spherical mirrors, sign convention for reflection by spherical mirrors , mirror formula and magnification , refractive index , refraction by spherical Lens , its image formation , lens formula , power of lens.

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In this chapter, you will learn the structure of the human eye and its functions, various eye defects such as myopia, hypermetropia, refraction through a prism, depression of white light by a glass prism, refraction through the atmosphere, Tyndall effect and Scattering of light.

NCERT Solutions for Class 10 Science Chapter 12 – Electricity

In this chapter, you will learn the concepts of electric current, circuit diagram, potential difference, resistance, the combination of resistance, heating effects of current and electrical power, constituents of electricity, current flow in an electrical circuit, Ohm’s law, resistivity, Joule’s law, electric fuse, electric power .

NCERT Solutions for Class 10 Science Chapter 13 – Magnetic Effects of Electric Current

In this chapter, you will learn about the magnetic field and field lines, magnetic field due to current carrying conductor , magnetic field due to the current through a straight conductor Right-hand thumb rule , force on a current carrying conductor placed in a magnetic field, magnetic field due to a current through a circular loop , magnetic field due to a current in a solenoid , circuits and working of electric motor and generator and electromagnetic induction , domestic electric circuits.

NCERT Solutions for Class 10 Science Chapter 14 – Sources of Energy

In this chapter, you will learn about source of energy , different forms of energy available to us such as conventional and non-conventional sources of energy , solar energy , energy from sea , geothermal energy , nuclear energy , thermal power plant , hydropower plants , improvements in technology for using conventional sources of energy and environmental consequences.

NCERT Solutions for Class 10 Science Chapter 15- Our Environment

Here you will learn the concepts of ecosystems, food chain, food web, waste management, biodegradable and non-biodegradable substances, a tropic level, biotic and abiotic components, producers, consumers, ozone formations and its depletion.

NCERT Solutions for Class 10 Science Chapter 16 – Management of Natural Resources

This chapter deals with the management of resources like forests, wildlife, water, coal, and petroleum, 5 types of R’s and methods of management of resources.

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Solved Questions For You:

Question 1. What happens when dilute hydrochloric acid is added to iron filings?

Answer: When dilute H C l is added to iron fillings the reaction proceeds as:

Question 2. What is a balanced chemical equation? Why should chemical equations be balanced?

Answer: A balanced chemical reaction is an equation that have equal numbers of each type of atom on both sides of the arrow.

Answer: Paint is applied to the iron articles to prevent them from corrosion by rust. Rust is an iron oxide, usually red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture.

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Class-10 Subject: SCIENCE

UNIT – VII- Atoms and Molecules

I.One Mark Questions

1. Number of electrons, protons and neutrons present in 17Cl35, 17Cl37 is-

--------------

a) 17e¯ , 17p+, 17n

17e¯ , 17p+, 19n

b) 18e¯ , 18p+, 17n

17e¯ , 20p+, 19n

c) 17e¯ , 17p+, 18n

17e¯ , 17p+, 20n

d) 18e¯ , 17p+, 18n

20e¯ , 20p+, 17n

2. Isobars are defined as---------

a) Elements show same atomic number with different mass number

b) Elements show same mass number with different atomic number

c) Elements show same valency

d) None of these

3. The Atomicity of Glucose molecule is ________.

a) 6 b) 12 c)24 d) 18

4. The mass of 5 moles of sodium is -------------

a) 46g b) 34g c) 105g d) 115g

5. Number of atoms present in 3 moles of iron is--------

a) 6.023 x 1023 b) 18.069 x 1023 c) 12.046 x 1023

d) None

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Part – B

II. Short Answer.

6. Define : Relative atomic mass

Relative atomic mass of an element is the ratio between the average mass of its isotopes to 1 / 12th part of the mass of a carbon – 12 atom. It is denoted as Ar.
Relative atomic mass = Average mass of the isotopes of the element / 1/12th of the mass of one Carbon- 12 atom

7. Give any two examples for heteroatomic molecules

Heterodiatomic molecules.

8. Calculate the number of moles in 46 g of Sodium?

9.Calculate the mass of the5×1023molecules of Glucose.

10.Calculate the number of molecules in 11.2 litre of CO2 at S.T.P.

Part – C

III. Write in detail.

1. Give the salient features of “Modern Atomic Theory”.

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10th std Science assignment Answer key,10th Science unit 2 Assignment Answer key , 10th

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Class 10 Science Assignments

We have provided below free printable Class 10 Science Assignments for Download in PDF. The Assignments have been designed based on the latest NCERT Book for Class 10 Science . These Assignments for Grade 10 Science cover all important topics which can come in your standard 10 tests and examinations. Free printable Assignments for CBSE Class 10 Science , school and class assignments, and practice test papers have been designed by our highly experienced class 10 faculty. You can free download CBSE NCERT printable Assignments for Science Class 10 with solutions and answers. All Assignments and test sheets have been prepared by expert teachers as per the latest Syllabus in Science Class 10. Students can click on the links below and download all Pdf Assignments for Science class 10 for free. All latest Kendriya Vidyalaya Class 10 Science Assignments with Answers and test papers are given below.

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This is a collection of free biology worksheets, notes, handouts, slides, study guides and quizzes. Most content targets high school, AP biology, genetics, anatomy/physiology, immunology, and biology 101 and 102 in college. There is also biochemistry and physics for biologists. However, some resources are at the grade school and middle school level.

The files are PDF, PNG, JPG, and formats using Google Apps for Google Classroom. Most of the time, these formats are interchangeable. So, if you see something you like, but want a different format, just let us know. Print these resources, make transparencies and slides, etc.

In the interest of quick load time, not all of the images are shown. If you’d rather see them all, just contact us!

Biochemistry

Understanding the Differences Between RNA and DNA - Worksheet

[ Google apps worksheet ][ worksheet PDF ][ answers PDF ][ worksheet PNG ][ answers PNG ]

Enzymes Definitions

[ Google Slides worksheet ][ worksheet PDF ][ answers PDF ][ worksheet PNG ][ answers PNG ]

20 Amino Acids [ PNG ][ PDF ]
Amino Acid Side Chains [ PNG ][ PDF ]
Identifying Type of Biological Macromolecules [ Google Slides worksheet ][ worksheet PDF ][ answers PDF ][ worksheet PNG ][ answers PNG ]
Disaccharide Examples [ PNG ]
Products of Photosynthesis [ JPG ]
Anabolism vs Catabolism [ PNG ]
3 Parts of a Nucleotide [ PNG ]
Fermentation Definition and Examples [ PNG ]

General and Cell Biology

Major Organelles and Their Function Worksheet

Organelles and Their Functions

Parts of a Plant Cell

Label Parts of a Chloroplast

[ Google Apps worksheet ][ worksheet PDF ][ answers PDF ][ worksheet PNG ][ answers PNG ]

Label Parts of a Mitochondria

Label the Animal Cell

[ Google Apps worksheet ][ worksheet PDF ][ worksheet PNG ][ answers PNG ]

Prokaryotes vs Eukaryotes Worksheet

Steps of the Cell Cycle

Steps of Mitosis

Membrane Transport Terms and Definitions

Membrane Transport Worksheet #2

The Plasma Membrane

Label a Bacterial Cell

Label a Bacteriophage [ Google Apps worksheet ][ worksheet PDF ][ worksheet PNG ][ answers PNG ]
Evidence of Evolution Worksheet [ Google Apps worksheet ][ Worksheet PDF ][ Worksheet PNG ][ Answers PNG ]
Evolutionary Processes Worksheet [ worksheet Google Apps ][ worksheet PDF ][ worksheet PNG ][ answers PNG ]
Major Receptor Families [ Google Apps worksheet ][ worksheet PDF ][ worksheet PNG ][ answers PNG ]
Label a Bacterial Cell Membrane ( E. coli ) [ Google Apps worksheet ][ worksheet PDF ][ worksheet PNG ][ answers PNG ]

Anatomy and Physiology

These worksheets are only a portion of the available anatomy and physiology worksheets. Human anatomy and physiology worksheets have their own section.

Label the Heart

Label the Eye

[ Google Apps worksheet ][ worksheet PDF ][ answers PDF ][ worksheet PNG ]

Types of Blood Cells

[ worksheet Google Apps ][ worksheet PDF ][ worksheet PNG ][ answers PNG ]

Label the Muscles

[ worksheet PDF ][ worksheet PNG ][ answers PNG ]

Label the Ear

[ Google Apps worksheet ][ Worksheet PDF ][ Worksheet PNG ][ Answers PNG ]

Label the Lungs

Label the Kidney

Label the Liver

Anatomy of the Large Intestine Worksheet

Label the Large Intestine

Label the Stomach

[ Google Apps worksheet ] [Worksheet PDF ][ Worksheet PNG ][ Answers PNG ]

External Nose Anatomy

[ Worksheet PDF ][ Worksheet Google Apps ][ Worksheet PNG ][ Answers PNG ]

Parts of the Nose

Label Bones of the Skeleton

Label the Lymph Node

Label the Parts of the Brain

Label the Lobes of the Brain

Anatomical Directions of the Brain Worksheet

Brain Anatomical Sections

Arteries of the Brain

Label the Pancreas

Label the Spleen

Label the Digestive System

Label the Respiratory System

Parts of a Neuron

Label the Lips

Label the Skin

Label the Circulatory System

The Urinary Tract

[ Worksheet PDF ][ Worksheet Google Apps ][ Worksheet PNG ][ Answer Key PNG ]

The Bladder

The Female Reproductive System [ worksheet PDF ][ worksheet Google Apps ][ worksheet PNG ][ answers PNG ]

Parts of a Flower

Label the Orchid Plant

[ Worksheet PDF ][ Worksheet Google Apps ][ Worksheet PNG ] [Answer Key PNG ]

Parts of an Orchid Flower

Parts of a Monocot Seed

Parts of a Fern

Parts of a Tree Trunk

Parts of a Tree

[ worksheet PDF ][ worksheet Google Apps ][ worksheet PNG ][ answers PNG ]

Parts of a Mushroom

Label the Shark

Label the Fish

Parts of a Bird

Bird Anatomy

Frog Life Cycle

Parts of a Mosquito (Insect)

Bones of the T. rex Skull

[ worksheets PDF ][ worksheet Google Slides ][ worksheet PNG ][ answers PNG ]

Holes of the T. rex Skull

Label the T. rex Skeleton [ worksheets PDF ][ worksheet Google Slides ][ worksheet PNG ][ answers PNG ]
Label Human Teeth [ Worksheet PDF ][ Worksheet Google Apps ][ Worksheet PNG ][ Answer Key PNG ]
Monocot vs Dicot Seeds [ worksheet PDF ][ worksheet Google Slides ][ worksheet PNG ][ answers PNG ]
Label the Moss [ worksheet PDF ][ worksheet Google Slides ][ worksheet PNG ][ answers PNG ]
Diagram of the Human Eye [ JPG ]

Use a completed worksheet as a study guide.

Cells of the Immune System

Immune Cell Functions

[ worksheet Google Apps ][ worksheet PDF ][ worksheet PNG #1][ answers PNG #1][ worksheet PNG #2][ answers PNG #2]

Methods to Study Virus Structures

[ worksheet Google Slide ][ worksheet PDF ][ worksheet PNG ][ answers PNG ]

Icosahedral Virus Capsids

Human DNA Viruses

Human RNA Viruses

This is selection of worksheets relating to DNA, RNA, transcription, translation, genetic crosses, plasmid mapping, etc. See the full collection of genetics worksheets if you’re don’t see what you need.

DNA Replication

Types of Mutations

Monohybrid Cross Worksheet #1

Monohybrid Cross Worksheet #2

Monohybrid Cross Worksheet #3

Monohybrid Cross #4 – Multiple Alleles

Monohybrid Cross Worksheet #5: Multiple Alleles [ worksheet Google Apps ][ worksheet PDF ][ worksheet PNG ][ answers PNG ]

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CBSE Class 10 Science Answer Key 2024

Select and write the most appropriate option out of the four options given for each of the questions 1-20. There is no negative mark for the incorrect response.

1. When 2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc in a test tube and then warmed, the reaction that occurs can be written in the form of a balanced chemical equation as:

(a) NaOH + Zn → NaZnO 2 + H 2 0

(b) 2NaOH + Zn → Na 2 ZnO 2 + H 2

(d) 2NaOH + Zn → Na 2 ZnO 2 + H 2 O

Answer: (b) 2NaOH + Zn → Na2ZnO2 + H2

2. Select from the following a decomposition reaction in which source of energy for decomposition is light:

(a) 2FeSO 4 → Fe 2 0 3 + SO 2 + SO 3

(b) 2H 2O → 2H 2 + O 2

(d) CaCO 3 → CaO + CO 2

Answer: (c) 2AgBr → 2Ag + Br2

3. A metal and a non-metal that exists in liquid state at the room temperature are respectively :

(a) Bromine and Mercury

(b) Mercury and lodine

(d) Iodine and Mercury

Answer: (c) Mercury and Bromine

4. Carbon compounds:

(i) are good conductors of electricity.

(ii) are bad conductors of electricity.

(iii) have strong forces of attraction between their molecules.

(iv) have weak forces of attraction between their molecules.

The correct statements are:

(a) (i) and (ii)

(b) (ii) and (iii)

(d) (i) and (iii)

Answer: (d) (i) and (iii)

5. Consider the following compounds :

FeSO 4 ; CuSO 4 ; CaSO 4 ; Na 2 CO 3

The compound having maximum number of water of crystallisation in its crystalline form in one molecule is :

(d) Na 2 CO 3

Answer: (d) Na2CO3 ; 10 water molecules

6. Oxides of aluminium and zine are :

(d) neutral

Answer: (c) amphoteric; behave as both acidic and basic oxides

7. MnO 2 + 4HCI → MnCl 2 + 2H 2O + Cl 2

The reaction given above is a redox reaction because in this case

(a) MnO 2 is oxidised and HCI is reduced.

(b) HCI is oxidised.

(d) MnO 2 is reduced and HCI is oxidised.

Answer: (d) MnO2 is reduced and HCI is oxidised; MnO 2 loses its oxygen to form MnCl 2 and HCl loses its H to form Cl 2 .

8. Consider the following statements

(i) The sex of a child is determined by what it inherits from the mother.

(ii) The sex of a child is determined by what it inherits from the father.

(iii) The probability of having a male child is more than that of a female child.

(iv) The sex of a child is determined at the time of fertilisation when male and female gametes fuse to form a zygote.

The correct statements are :

(a) (i) and (iii)

(b) (ii) and (iv)

(d) i), (iii) and (iv)

Answer: (b) (ii) and (iv)

9. Chromosomes :

(i) carry hereditary information from parents to the next generation.

(ii) are thread like structures located inside the nucleus of an animal cell.

(iii) always exist in pairs in human reproductive cells.

(iv) are involved in the process of cell division.

(b) (iii) and (iv)

(a) (i), (ii) and (iv)

(d) (i) and (iv)

Answer: (a) (i) and (ii)

10. In a nerve cell, the site where the electrical impulse is converted into a chemical signal is known as :

(b) Dendrites

(d) Cell body

Answer: (c) Neuromuscular junction; a neuromuscular junction (or myoneural junction) is a chemical synapse between a motor neuron and a muscle fiber.

11. A stomata closes when:

(i) it needs carbon dioxide for photosynthesis.

(ii) it does not need carbon dioxide for photosynthesis.

(iii) water flows out of the guard cells.

(iv) water flows into the guard cells.

The correct reason(s) in this process is/are :

(a) (i) only

(b) (i) and (iii)

(d) (ii) and (iv)

Answer: (c) (ii) and (iii);

Plant closes stomata when it does not need carbon dioxide for photosynthesis to prevent water loss.

When water exits from the guard cells, they become flaccid. This results in closing of stomata.

12. At what distance from a convex lens should an object be placed to get an image of the same size as that of the object on a screen?

(a) Beyond twice the focal length of the lens.

(b) At the principal focus of the lens.

(d) Between the optical centre of the lens and its principal focus.

Answer: (c) At twice the focal length of the lens;

Here the real image is formed at the other centre of curvature. The size of the image is the same as compared to that of the object.

13. The lens system of human eye forms an image on a light sensitive screen, which is called as:

(b) Ciliary muscles

Answer: (d) Retina

14. The pattern of the magnetic field produced inside a current carrying solenoid is:

Answer: (a); The field lines inside the solenoid are in the form of parallel straight lines.

15. Identify the food chain in which the organisms of the second trophic level are missing :

(a) Grass, goat, lion

(b) Zooplankton, Phytoplankton, small fish, large fish

(d) Grasshopper, grass, snake, frog, eagle

Answer:

16. In which of the following organisms, multiple fission is a means of asexual reproduction?

(b) Leishmania

(d) Plasmodium

Answer:

For Q. Nos. 17 to 20, two statements are given - One labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below :

(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).

(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).

(d) Assertion (A) is false, but Reason (R) is true.

17. Assertion (A): Hydrogen gas is not evolved when zinc reacts with nitric acid.

Reason (R): Nitric acid oxidises the hydrogen gas produced to water and itself gets reduced.

Answer: (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).

Explanation: Hydrogen gas is not evolved when a metal reacts with nitric acid. This is because HNO 3 is a strong oxidising agent. It oxidises H 2 , produces water and itself gets reduced to nitrogen oxide.

18. Assertion (A): Accumulation of harmful chemicals is maximum in the organisms at the highest trophic level of a food chain.

Reason (R): Harmful chemicals are sprayed on the crops to protect them from diseases and pests.

Answer: (b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).

Explanation: Harmful chemicals may enter an ecosystem and accumulate in the bodies of organisms at the bottom of the food chain, such as plants or small herbivores. As these contaminated organisms are consumed by higher trophic levels, the concentration of pollutants increases. This is because organisms at higher trophic levels eat multiple individuals from the lower trophic levels, magnifying the amount of the substance in their bodies.

19. Assertion (A): The rate of breathing in aquatic organisms is much faster than in terrestrial organisms.

Reason (R): The amount of oxygen dissolved in water is very high as compared to the amount of oxygen in air.

Answer: (c) Assertion (A) is true, but Reason (R) is false.

Explanation: The rate of breathing in aquatic organisms is much faster than in terrestrial organisms because the amount of dissolved oxygen is fairly lower in water than in air and aquatic organisms like fishes obtain oxygen from water present in the dissolved state.

20. Assertion (A): The rainbow is a natural spectrum of sunlight in the sky.

Reason (R): Rainbow is formed in the sky when the sun is overhead and water droplets are also present in air.

Explanation: As the rainbow is formed naturally by the reflection of sunlight inside the raindrops, it is called a natural spectrum appearing in the sky.

Keep refreshing this page for more answers.

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10th Science | Biology Assignment Answers 2021 TN SCERT Full Answer Key

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10th Science | Biology

Unit 12 plant anatomy and plant physiology.

Assignment Answers 2021

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Assignment

Subject: Science | Chemistry
UNIT 12 - Plant Anatomy and Plant Physiology

Biology UNIT-12 Plant Anatomy and Plant Physiology

Part – a.

I. Choose the correct answer

1. Who is the father of plant anatomy?

a) Sachs

b) Nehemiah Grew

c) Melvin Calvin

d) C.N.R.Rao

2. The group of cells which are similar or dissimilar in structure and origin that perform similar function is called

a) Organ System

b) Vascular Bundles

c) Tissues

d) Pericycle

3. The pores present in Epidermis are called

a) Stomata

b) Cuticle

c) Trichome

4. Xylem and Phloem are present in different radii of ----------

a) root

b) stem

c) leaf

5. If xylem and phloem lie on the same radii that vascular bundle is --------------

a) radial bundle

b) conjoint bundle

c) concentric and amphivasal

d) amphicribral

II. Short Answer

11.what are tissues, 12.classify the types of plant tissues..

Epidermis protects the inner tissues.
Stomata helps in transpiration.
Root hairs help in absorption of water and minerals.

13.What are the functions of Dermal or Epidremal tissue system?

The outer most covering layer of plants.
It contains epidermis, stomata and epidermal out growths.
Epidermis are interrupted by many minute pores called stomata.
Epidermis is covered by cuticle to check evaporation of water.
Trichomes and root hairs are some epidermal growths.

III. Write In detail

16.a)differentiate the following monocot root and dicot root, b) draw a neat labelled diagram of radial vascular bundle, 17.a) write the components and functions of plant tissue system., b) classify the tissues based on their ability to divide, you may like these posts, post a comment.

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NCERT Solutions
NCERT Solutions for Class 10
NCERT Class 10 Science
Chapter 1 Chemical Reactions And Equation

NCERT Solutions for Class 10 Science Chapter 1 Chemical Reactions and Equations

Ncert solutions for class 10 science chapter 1 – cbse download free pdf.

Download Exclusively Curated Chapter Notes for Class 10 Science Chapter – 1 Chemical Reactions and Equations

Download most important questions for class 10 science chapter – 1 chemical reactions and equations.

Chapter 1 of NCERT Solutions for Class 10 Science mainly deals with writing chemical equations and writing and balancing chemical equations. Also, in this chapter, students learn the basics of chemical reactions, their types and the effects of a chemical oxidation reaction in our daily lives. The NCERT Solutions Class 10 Science Chapter 1 provides an overview of the main concepts in the chapter and help them to get well-versed in important topics such as writing chemical equations and balancing them.

The NCERT Solutions for Class 10 Science Chapter 1 have good weightage, and there will be around 4 questions asked from this chapter every year. The types of questions that appear in this chapter are mostly practice-based questions. Thorough knowledge and good practice will help learners score full marks on the questions asked in this chapter.

Chapter 2 Acids, Bases and Salts
Chapter 3 Metals and Non-metals
Chapter 4 Carbon and Its Compounds
Chapter 5 Periodic Classification of Elements
Chapter 6 Life Processes
Chapter 7 Control and Coordination
Chapter 8 How Do Organisms Reproduce?
Chapter 9 Heredity and Evolution
Chapter 10 Light Reflection and Refraction
Chapter 11 The Human Eye and Colourful World
Chapter 12 Electricity
Chapter 13 Magnetic Effects of Electric Current
Chapter 14 Sources of Energy
Chapter 15 Our Environment
Chapter 16 Management of Natural Resources

NCERT Solutions for Class 10 Science Chapter

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Access answers to NCERT Class 10 Science Chapter 1 – Chemical Reactions and Equations

In-text questions set 1 Page number – 6

1. Why should a magnesium ribbon be cleaned before burning in the air?

Magnesium ribbon should be cleaned before burning in air because Magnesium metal reacts with the atmospheric oxygen and forms Magnesium Oxide (MgO) layer which is a very stable compound. In order to prevent further reactions with Oxygen, it is therefore necessary to clean the ribbon by to remove the layer of MgO.

2. Write a balanced equation for the following chemical reactions.

i) Hydrogen + Chloride —-> Hydrogen chloride

ii) Barium chloride + Aluminium sulphate —-> Barium sulphate + Aluminium chloride

iii) Sodium + Water —-> Sodium hydroxide + Hydrogen

i) H 2 + Cl 2 → 2HCl

ii) 3BaCl 2 + Al 2 (SO 4 ) 3 →3BaSO 4 + 2AlCl 3

iii) 2Na + 2H 2 O → 2NaOH + H 2

3. Write a balanced chemical equation with state symbols for the following reactions

i) Solutions of Barium chloride and Sodium sulphate in water react to give insoluble Barium sulphate and solution of Sodium chloride.

ii) Sodium hydroxide solution in water reacts with the hydrochloric acid solution to produce Sodium chloride solution and water.

i) BaCl 2 + Na 2 SO 4 → BaSO 4 + 2NaCl

ii) NaOH + HCl → NaCl + H 2 O

In-text questions set 2 Page number – 10

1. A solution of a substance, ‘X,’ is used for whitewashing.

(i) Name the substance ‘X’ and write its formula.

(ii) Write the reaction of the substance ‘X’ named in (i) above with water.

i) The substance ‘X’ which is used in whitewashing is quick lime or Calcium Oxide and its formula is CaO .

ii) CaO + H 2 O → Ca(OH) 2

2. Why is the amount of gas collected in one of the test tubes in Activity 1.7 double the amount collected in the other? Name this gas.

In activity 1.7, gas collected in one of the test tubes is double of the amount collected in the other because water gets hydrolysed to release H 2 and O 2 gas. Here, after electrolysis two molecules of Hydrogen and one molecule of oxygen gas are released; hence, the amount of Hydrogen collected would be double than that of oxygen.

In-text questions set 3 Page number – 13

1. Why does the colour of copper sulphate solution change when an iron nail is dipped in it?

When an iron nail is dipped in the copper sulphate solution, iron displaces copper from the copper sulphate because iron is more reactive than copper. Therefore, the colour of the copper sulphate solution changes. The reaction is

Fe + CuSO 4 → FeSO 4 + Cu

2. Give an example of a double displacement reaction other than the one given in Activity 1.10.

Solution:

Reaction Between silver nitrate (AgNO 3 ) and Sodium chloride (NaCl) is an example of a double displacement reaction. During the reaction, negative and positive ions trade positions as a result of the formation of white silver chloride precipitate. The chemical reaction is given below.

Ag + + NO 3 – + Na + + Cl – → AgCl + Na + + NO 3 –

3. Identify the substances that are oxidised and that are reduced in the following equation.

i) 4Na(s) + O 2 (g) → 2Na 2 O(s)

ii) CuO(s) + H 2 (g) → Cu(s) + H 2 O(l)

The Sodium (Na) in the first equation is getting oxidized with the addition of Oxygen (O 2 ), and the Copper (Cu) in the second equation is reduced due to the addition of Hydrogen (H 2 ).

Exercise Questions Page number – 14-16

1. Which of the statements about the reaction below are incorrect?

2PbO(s) + C(s) → 2Pb(s) + CO 2 (g)

(a) Lead is getting reduced

(b) Carbon Dioxide is getting oxidised

(d) Lead oxide is getting reduced

(i) (a) and (b)

(ii) (a) and (c)

(iii) (a), (b) and (c)

(iv) all the above

(i) (a) and (b)

Explanation: (a) Because Oxygen is being removed and (b) Because the removed oxygen from Lead is added to the elemental Carbon.

2. Fe 2 O 3 + 2Al → Al 2 O 3 + 2Fe

The above reaction is an example of a

Combination reaction

Double displacement reaction

Decomposition reaction

Displacement reaction

The answer is 4. Displacement reaction.

Explanation: The Oxygen from the Ferrous oxide is getting displaced to the Aluminium metal to form Aluminium Oxide. In this reaction, Aluminum is a more reactive metal than Fe. Therefore, Al will displace Fe from its oxide. This type of chemical reaction, called displacement reaction, is in which one of the elements displaces another. Here, less reactive metal is displaced by more reactive metal. Since one-time displacement is occurring, it is called a single displacement reaction.

3. What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer.

Hydrogen gas and Iron chloride are produced.
Chlorine gas and Iron hydroxide are produced.
No reaction takes place.
Iron salt and water are produced.

Explanation: The Chlorine from Hydrogen chloride is displaced by the Iron fillings to undergo the following reaction.

2HCl + Fe → FeCl 2 + H 2

4. What is a balanced chemical equation? Why should a chemical equation be balanced?

A balanced equation is the one in which number of different atoms on both the reactant and product sides are equal. Balancing chemical equations is necessary for the reaction should obey The Law of Conservation of mass. Balancing the chemical equation has no defined method and is purely a trial-and-error attempt.

5. Translate the following statements into chemical equations and balance them.

(a) Hydrogen gas combines with nitrogen to form ammonia.

(b) Hydrogen sulphide gas burns in the air to give water and sulphur dioxide.

(d) Potassium metal reacts with water to give potassium hydroxide and Hydrogen gas.

(a) Unbalanced: H 2 + N 2 → NH 3

Balanced: 3H 2 + N 2 → 2NH 3

(b) Unbalanced: H 2 S + O 2 → H 2 O + SO 2

Balanced: 2H 2 S + 3O 2 → 2H 2 O + 2SO 2

BaCl 2 + Al 2 (SO 4 ) 3 → AlCl 3 + BaSO 4

Balanced: 3BaCl 2 + Al 2 (SO 4 ) 3 → 2AlCl 3 + 3BaSO 4

(d) Unbalanced: K + H 2 O → KOH + H 2

Balanced: 2K + 2H 2 O → 2KOH + H 2

6. Balance the following chemical equations.

(a) HNO 3 + Ca(OH) 2 → Ca(NO 3 ) 2 + H 2 O

(b) NaOH + H 2 SO 4 → Na 2 SO 4 + H 2 O

(d) BaCl 2 + H 2 SO 4 → BaSO 4 + HCl

(a) 2HNO 3 + Ca(OH) 2 → Ca(NO 3 ) 2 + 2H 2 O

(b) 2NaOH + H 2 SO 4 → Na 2 SO 4 + 2H 2 O

(d) BaCl 2 + H 2 SO 4 → BaSO 4 + 2HCl

7. Write the balanced chemical equation for the following reactions.

Calcium hydroxide + Carbon dioxide —-> Calcium carbonate + Water

Zinc + Silver nitrate —-> Zinc nitrate + Silver

Aluminium + Copper chloride —-> Aluminium chloride + Copper

Barium chloride + Potassium sulphate —-> Barium sulphate + Potassium chloride

2Ca(OH) 2 + 2CO 2 → 2CaCO 3 + 2H 2 O

Zn + 2AgNO 3 → Zn(NO 3 ) 2 + 2Ag

2Al + 3CuCl 2 → 2AlCl 3 + 3Cu

BaCl 2 + K 2 SO 4 → BaSO 4 + 2KCl

8. Write a balanced chemical equation for the following and identify the type of reaction of each case.

KBr + BaI 2 → KI + BaBr 2

ZnCO 3 → ZnO + CO 2

H 2 + Cl → HCl

Mg + HCl → MgCl 2 + H 2

2KBr + BaI 2 → 2KI + BaBr 2 (Double Displacement Reaction)

ZnCO 3 → ZnO + CO 2 (Decomposition Reaction)

H 2 + Cl → 2HCl (Combination Reaction)

Mg + 2HCl → MgCl 2 + H 2 (Displacement Reaction)

9. What is meant by exothermic and endothermic reactions? Give examples.

An endothermic reaction occurs when energy is absorbed from the surroundings in the form of heat (For example, Photosynthesis, melting of ice, evaporation). Conversely, an exothermic reaction is one in which energy is released from the system into the surroundings (Examples: Explosions, concrete setting, nuclear fission and fusion).

10. Why is respiration considered to be an exothermic reaction?

For the survival of life, we require energy. We obtain this energy from the food we eat. The food molecules, through the process of digestion, is broken down into simpler molecule like glucose. These substances come in contact with the Oxygen present in our body cells to form Carbon dioxide and water along with a certain amount of energy (Respiration process). Since the energy is in the form of heat (that maintains our body temperature), respiration is considered to be an exothermic reaction. The reaction taking place is:

C 6 H 12 O 6 + 6O 2 → 6CO 2 + 6H 2 O + Energy

11. Why are decomposition reactions called the opposite of Combination reactions? Write equations for decomposition reactions.

Combination reaction is said to be the reaction between two or more molecules to form a larger molecule; whereas the decomposition reaction is defined as the splitting of larger molecules into two or more smaller molecules. This essentially explains that the decomposition reaction is the opposite of the combination reaction.

In most cases, the decomposition reaction is endothermic since the heat from the surrounding or induced heat is used to break the bonds of the larger molecule. A few examples of decomposition reactions are

CaCO 3 + Energy → CaO + CO 2

2HgO → 2Hg + O 2

12. Write one equation each for decomposition reactions in which energy is supplied in the form of heat, light or electricity.

(a) Thermal decomposition reaction (Thermolysis)

Decomposition of potassium chlorate: When heated strongly, potassium chlorate decomposes into potassium chloride and oxygen. This reaction is used for the preparation of oxygen.

2KClO 3 + Heat → 2KCl + 3O 2

(b) Electrolytic decomposition reaction (Electrolysis)

Decomposition of sodium chloride: On passing electricity through molten sodium chloride, it decomposes into sodium and chlorine.

NCERT Solution Class 10 Science Chapter 1-1

Decomposition of hydrogen peroxide: In the presence of light, hydrogen peroxide decomposes into water and oxygen.

NCERT Solution Class 10 Science Chapter 1-2

13. What is the difference between displacement and double displacement reactions? Write relevant equations for the above.

A displacement reaction is one when a more reactive substance displaces a less reactive one from its salt solution, whereas a double displacement reaction is one where a mutual exchange of ions happens between two compounds.

In a displacement reaction, only a single displacement takes place, whereas in the double displacement reaction, as the name suggests, two displacement takes place between the molecules.

Mg + 2HCl → MgCl 2 + H 2

2KBr + BaI 2 → 2KI + BaBr 2

14. In the refining of Silver, the recovery of silver from Silver nitrate solution involves displacement reaction by Copper metal. Write down the reaction involved.

Cu(s) + 2AgNO 3 (aq) → Cu(NO 3 ) 2 (aq) + 2Ag(s)

15. What do you mean by a precipitation reaction? Explain by giving examples.

When two solutions containing soluble salts are combined, a double displacement reaction takes place in which the ions are exchanged between the compounds. When one of such compounds formed is in solid form (that is insoluble in aqua), then it settles down at the bottom of the container. This solid is known as the precipitate and the respective reaction is termed as the precipitation reaction. A few examples of precipitation reactions are

CdSO 4 (aq) + K 2 S(aq) → CdS(s) + K 2 SO 4 (aq)

2NaOH(aq) + MgCl 2 (aq) → 2NaCl(aq) + Mg(OH) 2 (s)

16. Explain the following in terms of the gain of oxygen with two examples each.

(a) Oxidation

(b) Reduction

(a) In a chemical reaction, when the oxygen is added to the element to form its respective oxide it is the element being oxidised. Example:

4Na(s) + O 2 (g) → 2Na 2 O(s)

H 2 S + O 2 → H 2 O + SO 2

(b) In a chemical reaction, when the oxygen is removed from the compound, then it is said to be reduced. Example:

CuO(s) + H 2 (g) → Cu(s) + H 2 O(l)

17. A shiny brown coloured element ‘X’ on heating in the air becomes black in colour. Name the element ‘X’ and the black-coloured compound formed.

The shiny brown-coloured element is Copper metal (Cu). When the metal is heated in air, it reacts with atmospheric oxygen to form copper oxide. Hence, the black-coloured compound is copper oxide.

2Cu(s) + O 2 (g) → 2CuO(s)

18) Why do we apply paint on iron articles?

Iron articles are painted to prevent them from rusting. When left unpainted, the metal surface comes in contact with the atmospheric oxygen and in the presence of moisture it from Iron(III) oxide. But if painted, the surface does not come in contact with moisture and air, thus prevents Rusting.

19) Oil and Fat containing food items are flushed with Nitrogen. Why?

The main purpose of flushing Nitrogen into food packets that contain oil and fat items is to prevent Rancidity which occurs when the oil or fat reacts with the oxygen letting out an unpleasant smell and taste. Therefore, by flushing Nitrogen, an unreactive surrounding is created, thus preventing rancidity.

20) Explain the following terms with one example each.

(a) Corrosion

(b) Rancidity

(a) Corrosion is a process where a refined metal is oxidised by atmospheric oxygen to form a more stable compound, such as oxides. The metal gradually degrades during the corrosion process. Rusting of iron is a good example of corrosion where the iron is converted to Iron oxide. Millions of dollars are spent annually in preventing rusting from bridges and other monuments.

(b) The condition produced by the aerial oxidation of the oil and fat present in the food material that produces an unpleasant taste and smell. The rancidity is retarded when the food is kept inside the refrigerator since the low temperature does not promote the oxidation reaction.

Topics Covered under Class 10 Chapter 1 Science Chemical Reactions and Equations

Chemical Reactions and equations is a very fundamental chapter that deals with basic knowledge of chemical reactions and equations. Students are advised to get tuned in with this chapter to avoid any sort of difficulty in understanding advanced topics of chemistry. If you are planning to take science in your higher secondary school, this is one of the important chapters you have to memorise for a very long period of time.

Features of NCERT Solutions for Class 10 Chapter 1 Science Chemical Reactions and Equations

Students can get comprehensive practice in balancing different kinds of equations.
NCERT Solutions will help students write different chemical equations appropriately
Help them get a thorough practice of solving questions of varied difficulty before facing the CBSE examination.

A chemical reaction is an important phenomenon in our lives. We come across various chemical reactions like rusting of iron, curdling of milk, respiration, digestion and growth. In order to score good marks in the CBSE Class 10 examination, students must practise the NCERT Solution for Class 10 Science Chapter 1 provided here.

At BYJU’S, students get free NCERT Solutions for all the classes, subjects and chapters. To help them with CBSE exam preparation, BYJU’S also provides NCERT notes, videos, animations, previous years’ question papers, sample papers, NCERT exemplar solutions and textbooks.

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CBSE Class 10 Science Answer Key 2024, Question Paper Analysis for All Sets 1,2,3

CBSE Class 10 Science Exam has been conducted on March 02, 2024. The direct link to download CBSE Class 10 Science Answer Key 2024 with Question Paper Analysis for SET 1,2,3 has been shared here.

Table of Contents

CBSE Class 10 Science Answer Key 2024: The Central Board of Secondary Education has successfully conducted the CBSE Class 10 Board Science examination 2024 today i.e., March 02, 2024. The CBSE Class 10th Science exam was conducted from 10:30 am to 01:30 pm at different exam centers. As the CBSE Class 10th Science Board exam has been successfully conducted all the CBSE Class 10th students can download the complete CBSE Class 10 Science Answer Key 2024 with Complete Question Paper Analysis for All SETs 1, 2, and 3 from the direct link that has been shared in the article below.

CBSE Class 10 Science Answer Key 2024

The CBSE Class 10th Science Board Examination 2024 has been successfully conducted today i.e., March 02, 2024 at 01:30 pm. The CBSE Board Class 10th science board exam 2024 was scheduled to be conducted in offline mode i.e., pen and paper mode. Students were allotted a time duration of 3 hours to complete the exam whereas an extra 15 minutes were given for reading the question paper. As per CBSE, the Class 10th science syllabus comprised a total of 13 chapters categorized into Physics, Chemistry, and Biology. The CBSE Class 10th Science Board question paper included both objective and subjective types of questions. Students will get the direct link to download the PDF of CBSE Class 10the Science Question Paper 2024 along with the answer key here.

Class 10 Science Answer Key 2024

The CBSE Class 10th Science question paper consists of a total of 39 questions that were further divided into 05 different sections. Where Section A consists of 20 objective-type questions carrying 1 mark each, Section B comprises 06 Very Short questions carrying 02 marks each. The CBSE Board Class 10 Science Question Paper 2024 followed the same pattern as given in the CBSE Class 10th Science Board Model Paper 2024.

Class 10 Science Answer Key 2024 All SETs 1,2,3

Our subject expert’s faculty has prepared the specially designed CBSE Class 10 Science Answer Key 2024 for the questions that are asked in the CBSE Class 10th Science Exam. The CBSE Class 10 Science Answer Key 2024 PDF can easily be downloaded from the direct link that has been shared here.

CBSE Class 10 Science Answer Key 2024 SET 31/5/1

Select and write the most appropriate option out of the four options given for each of the questions no. 1 to 20.

1. To balance the following chemical equation, the values of the coefficients x, y and z must be respectively:

x Zn(NO3)2 → y ZnO + NO2 + O2

(A) 4, 2, 2

(B) 4, 4, 2

(D) 2, 4, 2

Answer: (C) 2, 2, 4

2. Which of the following is a redox reaction, but not a combination reaction? (A) C+ O2→CO2 (B) 2 Mg + O2 → 2 MgO (C) 2H2 + O2→2 H2O (D) Fe2O3+ 3CO → 2 Fe + 3CO2

Answer: (D) Fe2O3+ 3CO → 2 Fe + 3CO2

3. The salt present in tooth enamel is:

(A) Calcium phosphate

(B) Magnesium phosphate

(D) Aluminium phosphate

Answer: (A) Calcium phosphate

4. An aqueous solution of sodium chloride is prepared in distilled water. The pH of this solution is:

Answer: (C) 7

5. A metal ‘X’ is used in thermit process. When ‘X’ is heated with oxygen, it gives an oxide ‘Y’, which is amphoteric in nature. ‘X’ and ‘Y’ respectively are:

(A) Mn, MnO2

(B) Al, Al2O3

(D) Mg, MgO

Answer: (B) Al, Al2O3

6. The process in which transport of soluble products of photosynthesis takes place in plants is known as:

(A) Transpiration

(B) Evaporation

(D) Translocation

Answer: (D) Translocation

7. The correct sequence of events when someone’s hand touches a hot object unconsciously:

(A) Receptors in skin Motor neuron → Relay neuron → Sensory neuron Effector muscle in arm

(B) Receptors in skin Relay neuron Sensory neuron → Motor neuron Effector muscle in arm

(D) Receptors in skin Sensory neuron → Effector muscle in arm → Motor neuron → Relay neuron

Answer: (C) Receptors in skin → Sensory neuron → Relay neuron → Motor neuron Effector muscle in arm

8. The sense organ in which olfactory receptors are present is:

(D) Inner ear

Answer: (A) Nose

9. The incorrect statement about placenta is:

(A) It is a disc embedded in the uterine wall.

(B) It contains villi on the embryo’s side of the tissue.

(D) The embryo gets nutrition from the mother’s blood through it.

Answer: (C) It has a very small surface area for glucose and oxygen to from mother to the embryo.

10. Select from the following the conditions responsible for the rapid spread of bread mould on a slice of bread:

(i) Formation of large number of spores

(ii) Presence of moisture and nutrients in bread

(iii) Low temperature

( iv) Presence of hyphae

(A) (i) and (ii)

(B) (ii) and (iv)

(D) (iii) and (iv)

Answer: (A) (i) and (ii)

11. How will the image formed by a convex lens be affected, if the upper half of the lens is wrapped with a black paper?

(A) The size of the image formed will be one-half of the size of the image due to complete lens.

(B) The image of upper half of the object will not be formed.

(D) The lower half of the inverted image will not be formed

Answer: (C) The brightness of the image will reduce.

For Questions number 17 to 20, two statements are given one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below. (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). (C) Assertion (A) is true, but Reason (R) is false. (D) Assertion (A) is false, but Reason (R) is true.

17. Assertion (A): Some vegetable oils are healthy. Reason (R): Vegetable oils generally have long unsaturated carbon chains.

Answer: (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).

18. Assertion (A): Sex of the children will be determined by what they inherit from their mother. Reason (R): Women have XX sex chromosomes.

Answer: (D) Assertion (A) is false, but Reason (R) is true.

19. Assertion (A): Electrons move from lower potential to higher potential in a conductor. Reason (R): A dry cell maintains electric potential difference across the ends of a conductor.

20. Assertion (A): Ozone layer protects the surface of the Earth from harmful UV radiations. Reason (R): Chlorofluorocarbons (CFCs) are responsible for depletion of ozone layer

Questions no. 21 to 26 are very short answer-type questions.

21. (a) Copper powder is taken in a china dish and heated over a burner. Name the product formed and state its colour. Write the chemical equation for the reaction involved.

(b) Write chemical equation for the chemical reaction which occurs when the aqueous solutions of barium chloride and sodium sulphate react together. Write the symbols of the ions present in the compound precipitated in the reaction.

22. The melting and boiling points of carbon compounds are generally low and they are largely non-conductors of electricity. State two conclusions based on these two properties.

23. (a) Sometimes while running, the athletes suffer from muscle cramps. Why? How is the respiration in this case different from aerobic respiration?

(b) Write the other name given to lymph. State its two functions.

24. Some unicellular organisms such as Plasmodium and Leishmania differ in the manner in which they reproduce. Name and explain the reproductive process taking place in them.

25. The heat produced at a point due to concentration of sunlight by a convex lens burns a paper.

(a) Explain why it happens.

(b) Name the term (in the context of the lens used) given to the point at which the paper starts burning. What does the bright spot formed on the paper represent?

26. An electric source can supply a charge of 500 coulomb. If the current drawn by a device is 25 mA, find the time in which the electric source will be discharged completely.

Section – C

CBSE Class 10 Science Answer Key 2024, Question Paper Analysis SETs 1,2,3_5.1

Study the experimental set-up shown in the diagram and write chemical equation for the chemical reaction involved. Name and define the type of reaction. List two other metals which can be used in place of iron to show the same type of reaction with copper sulphate solution.

28. Name the ore of mercury and state the form in which it is found in nature. Write the chemical equations along with the condition required for the reactions involved in the extraction of mercury from its ore.

29. Taking the example of any two animal hormones along with their gland of secretion, explain how these hormones help

(i) in growth and development and

(ii) regulate metabolism, in the body.

30. Mendel crossed pure tall pea plants (TT) with pure short pea plants (tt) and obtained F₁ progeny. When the plants of F₁ progeny were self-pollinated, plants of F₂ progeny were obtained.

(a) What did the plants of F₁ progeny look like? Give their gene combination.

(b) Why could the gene for shortness not be expressed in plants of F₁ progeny?

(c) Write the ratio of the plants obtained in F₂ progeny and state the conclusion that can be drawn from this experiment.

31. (a) Study the diagram given below and answer the questions that follow :

CBSE Class 10 Science Answer Key 2024, Question Paper Analysis SETs 1,2,3_6.1

(i) Name the defect of vision depicted in this diagram stating the part of the eye responsible for this condition.

(ii) List two causes of this defect.

(iii) Name the type of lens used to correct this defect and state its role in this case.

(b) What is dispersion of white light? State its cause. Draw a diagram to show dispersion of a beam of white light by a glass prism.

32. (a) What happens when a bundle of wires of soft iron is placed inside the coil of a solenoid carrying a steady current ? Name the device obtained. Why is it called so?

(b) Draw the magnetic field lines inside a current carrying solenoid. What does this pattern of magnetic field lines indicate?

33. Differentiate between food chain and food web. In a food chain consisting of deer, grass and tiger, if the population of deer decreases, what will happen to the population of organisms belonging to the first and third trophic levels?

Questions no. 34 to 36 are long answer type questions.

34. (a) A few crystals of ferrous sulphate were taken in a dry boiling tube and heated. Tiny water droplets were observed in the tube after some time.

(i) From where did these water droplets appear? Explain.

(ii) What colour change will be observed during heating?

(iii) How many molecules of water are attached per molecule of FeSO4 crystal? Write the molecular formula of crystalline forms of (I) Copper sulphate, and (II) Sodium carbonate.

(iv) State how is Plaster of Paris obtained from gypsum. Write two uses of Plaster of Paris.

(b) An acid ‘X’ present in tamarind when mixed with ‘Y’, produces a mixture ‘Z’. ‘Z’ on addition to a dough when heated makes cakes soft and spongy. ‘Y’ is prepared from common salt and helps in faster cooking.

(i) Write the common names of ‘X’, ‘Y’ and ‘Z’, and the chemical formula of ‘Y’.

(ii) How is ‘Y’ prepared and how does it help in making cakes soft and spongy? Illustrate the reaction with suitable chemical equation.

(iii) Write the name and chemical formula of a mild base other than ‘Y’ used as an antacid.

35. (a) Design an experiment to demonstrate that carbon dioxide is essential for photosynthesis. Write the observation and conclusion of the experiment.

CBSE Class 10 Science Answer Key 2024, Question Paper Analysis SETs 1,2,3_7.1

In the experimental set-up shown above in diagram (I) atmospheric air is being passed into lime water with a syringe while in diagram (II) air is being exhaled into lime water. The time taken for the lime water to turn milky in both the test tubes is different. Give reason.

(ii) Draw the diagram of an open stomatal pore and label (I) Guard cells, and (II) Chloroplast on it. Mention two functions performed by stomata.

36. (a ) (i) The potential difference across the two ends of a circuit component is decreased to one-third of its initial value, while its resistance remains constant. What change will be observed in the current flowing through it ? Name and state the law which helps us to answer this question.

(ii) Draw a schematic diagram of a circuit consisting of a battery of four 1.5 V cells, a 5 resistor, a 10 Ω resistor and a 15 Ω resistor and a plug key, all connected in, series. Now find (I) the electric current passing through the circuit, and (II) potential difference across the 10 Ω resistor when the plug key is closed.

(b) (i) When is the potential difference between two points said to be 1 volt?

(ii) A copper wire has a diameter of 0.2 mm and resistivity of 1-6 × 10-8 2 m. What will be the length of this wire to make its resistance 14 Ω ? How much does the resistance change, if the diameter of the wire is doubled?

Questions no. 37 to 39 are case-based/data-based questions with 3 short sub-parts. Internal choice is provided in one of these sub-parts.

37. Carbon is a versatile element that forms the basis of all living organisms and many of the things we use. A large variety of compounds is formed because of its tetravalency. Compounds of carbon are formed with oxygen, hydrogen, nitrogen, sulphur, chlorine and many other elements. Answer the following questions:

(a) What are hydrocarbons?

(b) List two properties by virtue of which carbon can form a large number of compounds.

(c) (i) Write the formula of the functional group present in (1) aldehydes, and (2) ketones. Write chemical equation for the reaction that occurs between ethanoic acid and ethanol in the presence of a catalyst.

38. Pollination is an important process in sexual reproduction of plants. It is an essential process that facilitates fertilisation in plants. Pollinating agents can be wind, water, insects and birds. Several changes take place in the flower after the fertilization has taken place.

(a) Write the main difference between self-pollination and cross-pollination.

(b) Name the part of the flower which attracts insects for pollination. What happens to this part after fertilisation?

(c) (ii) In a germinating seed, which parts are known as future shoot and future root? Mention the function of cotyledon.

39. A highly polished surface such as a mirror reflects most of the light falling on it. In our daily life we use two types of mirrors – plane and spherical. The reflecting surface of a spherical mirrors may be curved inwards or outwards. In concave mirrors, reflection takes place from the inner surface, while in convex mirrors reflection takes place from the outer surface.

(a) Define the principal axis of a concave mirror.

(b) A ray of light is incident on a concave mirror, parallel to its principal axis. If this ray after reflection from the mirror passes through the principal axis from a point at a distance of 10 cm from the pole of the mirror, find the radius of curvature of the mirror.

(c) (i) An object is placed at a distance of 10 cm from the pole of a convex mirror of focal length 15 cm. Find the position of the image.

(c) (ii) A mirror forms a virtual, erect and diminished image of an object. Identify the type of this mirror. Draw a ray diagram to show the image formation in this case.

Class 10 Science Answer Key 2024 SET 31/4/2

Select and write the most appropriate option out of the four options given for each of the questions no. 1 to 20. There is no negative marking for incorrect response.

1. A chemical reaction in which exchange of ions occurs between the reactants, is known as:

(A) Endothermic Reaction

(B) Exothermic Reaction

(D) Displacement Reaction

Answer: (C) Double Displacement Reaction

2. A zygote is formed by the fusion of a male gamete and a female gamete. The number of chromosomes in the zygote of a human is:

Answer :(C) 46

3. The part of seed which is a source of food during germination of seed is :

(A) Cotyledon.

(B) Radicle

Answer: (A) Cotyledon.

4. The plants that can be raised by the method of vegetative propagation are:

(A) Sugarcane, roses, grapes

(B) Sugarcane, mustard, potato

(D) Papaya, mustard, potato

5. A plant growth inhibitor hormone which causes wilting of leaves is called:

(B) Cytokinin

(D) Gibberellin

Answer: (C) Abscisic acid.

6. An aqueous solution of a salt turns blue litmus to red. The salt could be the one obtained by the reaction of:

(A) HNO3 and NaOH

(B) H₂SO₄ and KOH

(D) HCl and NH OH

7. Four solutions, namely glucose, alcohol, hydrochloric acid and sulphuric acid filled in four separate beakers are connected one by one in an electric circuit with a bulb. The solutions in which the bulb will glow when current is passed are:

(A) Glucose and alcohol

(B) Alcohol and hydrochloric acid

(D) Hydrochloric acid and sulphuric acid

8. The metals which are found in both free state as well as combined state are:

(A) Gold and platinum

(B) Platinum and silver

(D) Gold and silver

9. The number of single and double bonds present in a molecule of benzene (C8Hg) respectively, are:

(A) 6 and 6

(B) 9 and 3

(D) 3 and 3

10. In human beings, when the process of digestion is completed, the (i) proteins, (ii) carbohydrates, and (iii) fats are respectively finally converted into:

(A) (i) Amino acids, (ii) glucose and (iii) fatty acids

(B) (i) Amino acids, (ii) glucose, (ii) fatty acids and glycerol

(D) (i) Sugars, (ii) amino acids, (iii) fatty acids and glycerol

11. Some wastes are given below:

(i) Garden waste

(ii) Ball point pen refills

(iii) Empty medicine bottles made of glass

(iv) Peels of fruits and vegetables

(v) Old cotton shirt

The non-biodegradable wastes among these are:

(B) (ii) and (iii)

(D) (i), (iii) and (iv)

12. A rectangular loop ABCD carrying a current I is situated near a straight conductor XY, such that the conductor is parallel to the side AB of the loop and is in the plane of the loop. If a steady current I is established in the conductor as shown, the conductor XY will

CBSE Class 10 Science Answer Key 2024, Question Paper Analysis SETs 1,2,3_8.1

(A) remain stationary

(B) move towards the side AB of the loop.

(D) rotate about its axis.

13. Absolute refractive index of glass and water is and respectively. If 2 3 the speed of light in glass is 2 x 108m/s, the speed of light in water is:

(A) 9/4 x 10 8 m/s 4

(B) 5/2 × 10 8 m/s

(D) 16 /9 x 10 8 m/s

14. When a beam of white light passes through a region having very fine dust particles, the colour of light mainly scattered in that region is:

15. Consider the following combinations of resistors:

CBSE Class 10 Science Answer Key 2024, Question Paper Analysis SETs 1,2,3_9.1

The combinations having equivalent resistance 1 2 is/are:

(A) I and IV

(B) Only IV

(D) I, II and III

16. An electric iron of resistance 20 Ω draws a current of 5 A. The heat developed in the iron in 30 seconds is:

(A) 15000 J

For Questions number 17 to 20, two statements are given – one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below.

(A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

(B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A).

(D) Assertion (A) is false, but Reason (R) is true.

17. Assertion (A): Oxygen is essential for all aerobic forms of life.

Reason (R): Free oxygen atoms combine with molecular oxygen to A form ozone.

18. Assertion (A): Most of the plants close their stomata at night.

Reason (R) Closing of stomata helps to conserve water as large amount of water evaporates from the leaves.

19. Assertion (A): The extraction of metals from their sulphide ores cannot take place without roasting of the ore.

Reason (R) Roasting converts sulphide ores directly into metals.

20. Assertion (A): Magnetic field lines never intersect each other.

Reason (R): If they intersect, then at the point of intersection, the compass needle would point towards two directions, which is not possible.

Class 10 Science Answer Key 2024 SET 31/2/3

Select and write one most appropriate option out of the four options given for each of the questions 1 to 20:

1. An iron nail is placed in a solution of copper sulphate. The nail is taken out after 15 minutes. The nail will be found to be covered with:

(A) blue deposit

(B) brown deposit

(D) green deposit

2. Consider the following cases:

(a) CaSO4 + Al →

(b) CuSO,+Ca →

(d) ZnSO4 + Mg →

The cases in which new products will form are –

(A) (a) and (b)

(B) (b) and (c)

(D) (b) and (d)

3. Which of the following reactions is an endothermic reaction?

(A) Burning of coal

(B) Decomposition of vegetable matter into compost

(D) Decomposition of calcium carbonate to form quick lime and carbon dioxide.

4. The oxide which can react with HCl as well as KOH to give corresponding salt and water is

5. The juice of tamarind turns blue litmus to red. It is because of the presence of an acid called:

(A) methanoic acid

(B) acetic acid

(D) oxalic acid

6. Consider the following statements about homologous series of carbon compounds:

(a) All succeeding members differ by -CH, unit.

(b) Melting point and boiling point increases with increasing molecular mass.

(d) C₂H₂ and C, H, are NOT the successive members of the alkyne series.

The correct statements are –

(D) (c) and (d)

7. Identify the correct statement about the following reaction:

2H₂S + SO₂ → 2H2O+S

(A) H₂S is oxidising agent and SO, is reducing agent.

(B) H₂S is reduced to sulphur.

(D) SO₂ is oxidised to sulphur.

8. In the given diagram the leaf shown belongs to which plant?

CBSE Class 10 Science Answer Key 2024, Question Paper Analysis SETs 1,2,3_10.1

(A) Hibiscus

(B) Money plant

(D) Bryophyllum

9. Select out of the following a gland which does NOT occur as a pair in the human body:

(A) Pituitary

(D) Adrenal

10. In human respiratory system, when a person breathes in, the position of ribs and diaphragm will be:

(A) lifted ribs and curve/dome shaped diaphragm.

(B) lifted ribs and flattened diaphragm.

(D) relaxed ribs and curve/dome shaped diaphragm.

11. Which of the following statement(s) is (are) true about human heart?

(a) Right atrium receives oxygenated blood from lungs through pulmonary artery.

(b) Left atrium transfers oxygenated blood to left ventricle which sends it to various parts of the body.

(d) Left atrium transfers oxygenated blood to aorta which sends it to different parts of the body.

(B) (a) and (d)

12. A cross made between two pea plants produces 50% tall and 50% short pea plants. The gene combination of the parental pea plants must be

(A) Tt and Tt

(B) TT and Tt

(D) TT and tt

13. Study the I-V graph for three resistors of resistances R₁, R 2 and R 3 and select the correct statement from the following:

CBSE Class 10 Science Answer Key 2024, Question Paper Analysis SETs 1,2,3_11.1

(A) R₁=R 2 =R 3

(B) R₁>R 2 >R 3

(D) R 2 >R 3 >R₁

14. The maximum resistance of a network of five identical resistors of 1/5 Ω each can be –

15. The speed of light in a vacuum is 3 ×10 8 m/s. If the speed of light in a medium is 2.25 x 10 8 m/s, the absolute refractive index of the medium is

16. Study the following statements:

(a) A fuse in a circuit prevents damage to the circuit due to overloading.

(b) Total resistance in a circuit increases due to overloading.

(d) In order that each appliance has same current, they are connected in parallel to each other. The correct statements are

(B) (b) and (d)

(D) (a), (c) and (d)

Q. No. 17 to 20 are Assertion – Reason based questions:

These questions consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting the appropriate option given below:

(A) Both (A) and (R) are true and (R) is the correct explanation of (A).

(B) Both (A) and (R) are true, but (R) is not the correct explanation of (A).

(D) (A) is false, but (R) is true.

17. Assertion (A): Carbon reduces the oxides of Sodium and Magnesium.

Reason (R): Sodium and Magnesium have more affinity for Oxygen than Carbon.

18. Assertion (A): The deflection of a compass needle placed near a current carrying wire decreases when the magnitude of an electric current in the wire is increased.

Reason (R): Strength of the magnetic field at a point due to a current carrying conductor increases on increasing the current in the conductor.

19. Assertion (A): The colour of clear sky appears blue.

Reason (R): Light of blue colour has longer wavelength as compared to the light of red colour so it is scattered more in the upper atmosphere.

20. Assertion (A): Human female has a perfect pair of sex chromosome.

Reason (R): Sex chromosome contributed by the human male in the zygote decides the sex of a child.

Class 10 Science Answer Key 2024 SET 31/5/3

1. Select from the following the conditions responsible for the rapid spread of bread mould on a slice of bread: (i) Formation of large number of spores (ii) Presence of moisture and nutrients in bread (iii) Low Temperature (iv) Presence of Hyphae

(A) (i) and (ii) (B) (ii) and (iv) (C) (ii) and (iii) (D) (iii) and (iv)

2. The incorrect statement about placenta is : (A) It is a disc embedded in the uterine wall. (B) It contains villi on the embryo’s side of the tissue. (C) It has a very small surface area for glucose and oxygen to pass from mother to the embryo. (D) The embryo gets nutrition from the mother’s blood through it.

3. An aqueous solution ‘A’ turns phenolphthalein solution pink. When another aqueous solution ‘B’ is added to the pink solution, the pink colour disappears. Now when a few drops of solution ‘A’ are added to this reaction, the mixture appears pink again. The respective changes in the nature of the solution are from : (A) acidic → basic → basic

(B) basic → acidic → acidic

(D) basic → acidic → basic

Answer: (D) basic → acidic → basic

4. The correct sequence of events when someone’s hand touches a hot object unconsciously : (A) Receptors in skin → Motor neuron → Relay neuron → Sensory neuron → Effector muscle in arm (B) Receptors in skin → Relay neuron → Sensory neuron → Motor neuron → Effector muscle in arm (C) Receptors in skin → Sensory neuron → Relay neuron → Motor neuron → Effector muscle in arm (D) Receptors in skin → Sensory neuron → Effector muscle in arm → Motor neuron → Relay neuron

5. To balance the following chemical equation, the values of the coefficients x, y and & must be respectively : Zn(NO3)2 A → y ZnO + z NO2 + O2 (A) 4, 2, 2 (B) 2, 2, 4 (C) 4, 4, 2 (D) 2, 4, 2

Answer: (B) 2, 2, 4

6. Which of the following is a redox reaction, but not a combination reaction? (A) C+ O2→CO2 (B) 2 Mg + O2 → 2 MgO (C) 2H2 + O2→2 H2O (D) Fe2O3+ 3CO → 2 Fe + 3CO2

7. An aqueous solution of sodium chloride is prepared in distilled water. The pH of this solution is:

8. A metal X’ is used in thermit process. When X’ is heated with oxygen, it gives an oxide Y, which is amphoteric in nature. X’ and Y respectively are : (A) Mn, MnO2 (C) Fe, Fe2O3 (B) Al, Al2O3 (D) Mg, MgO

9. The process in which transport of soluble products of photosynthesis takes place in plants is known as :

(A)Transpiration (C) Conduction (B) Evaporation (D) Translocation

10. Sense organ in which olfactory receptors are present is (A) Nose (B) Skin (C)Tongue (D)Inner ear

CBSE Class 10 Science Answer Key 2024, Question Paper Analysis SETs 1,2,3_12.1

Answer: (C) Reflection, Dispersion and Internal Reflection

15. The colour of light for which the refractive index of glass is minimum, is: (A) Red (B) Yellow (C)Green (D) Violet

Answer: (A) Red

16. The current carrying device which produces a magnetic field similar to that of a bar magnet is : (A) A straight conductor (B) A circular loop (C) A solenoid (D) A circular coil

Answer: (C) A Solenoid

For Questions number 17 to 20, two statements are given — one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (A), (B), (C) and (D) as given below. (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). (C) Assertion (A) is true, but Reason (R) is false. (D) Assertion (A) is false, but Reason (R) is true.

17. Assertion (A) : Electrons move from lower potential to higher potential in a conductor. Reason (R) : A dry cell maintains electric potential difference across the ends of a conductor.

18. Assertion (A) : Some vegetable oils are healthy. Reason (R): Vegetable oils generally have long unsaturated carbon chains.

19. Assertion (A): Sex of the children will be determined by what they inherit from their mother. Reason (R): Women have XX sex chromosomes.

20. Assertion (A): Green plants trap only 1% of the energy of sunlight that falls on their leaves. Reason (R) : All green plants are the producers in a food chain.

Questions no. 21 to 26 are very short answer type questions. 21. (a) Sometimes while running, the athletes suffer from muscle cramps. Why? How is the respiration in this case different from aerobic respiration? OR (b) Write the other name given to lymph. State its two functions.

22. Write the formula and the molecular mass of the third homologue of alcohols. State how the boiling point of an alcohol changes as one moves from lower to higher homologues.

23. (a) Copper powder is taken in a china dish and heated over a burner. Name the product formed and state its colour. Write the chemical equation for the reaction involved. OR (b) Write chemical equation for the chemical reaction which occurs when the aqueous solutions of barium chloride and sodium sulphate react together. Write the symbols of the ions present in the compound precipitated in the reaction.

24. Identify the organ in the human female reproductive system where the sperm encounters the egg cell. What will happen if it is blocked ? Name the technique by which it can be blocked.

25. The linear magnification produced by a spherical mirror is +3.” Based on this statement answer the following questions : (a) What is the type of mirror? (b) Where is the object located ? (c) List two properties of the image formed (other than the size/magnification).

26. The filament of an electric lamp draws a current of 0•5 A, which lights for 2 hours. Calculate the charge that flows through the circuit.

27. Answer the following questions in the context of electrolysis of water : (a) Why is this reaction/process called a decomposition reaction? (b) Giving reason state whether this reaction is exothermic or endothermic. (c) Name the gases collected at the anode and cathode. (d) What is the mass ratio of the gases collected at the anode and cathode ?

28. Differentiate between food chain and food web. In a food chain consisting of deer, grass and tiger, if the population of deer decreases, what will happen to the population of organisms belonging to the first and third trophic levels?

29. Name a plant growth hormone synthesized at the shoot tip. Explain its effect on the growth of a plant in response to light.

30. Name the ore of mercury and state the form in which it is found in nature. Write the chemical equations along with the condition required for the reactions involved in the extraction of mercury from its ore.

31. Mendel crossed pure tall pea plants (TT) with pure short pea plants (tt) and obtained F, progeny. When the plants of F, progeny were self-pollinated, plants of F2 progeny were obtained.

(a) What did the plants of F1 progeny look like? Give their gene combination. (b) Why could the gene for shortness not be expressed in plants of Fi progeny? (c) Write the ratio of the plants obtained in F2 progeny and state the conclusion that can be drawn from this experiment.

Class 10 Science Answer Key 2024 SET 3 (31/1/3)

(a) NaOH + Zn → NaZnO2 + H20 (b) 2NaOH + Zn → Na2ZnO2 + H2 (c) 2NaOH + Zn → NaZnO2 + H2 (d) 2NaOH + Zn → Na2ZnO2 + H2O

Answer: (b) 2NaOH + Zn → Na2ZnO2 + H2

2. Select from the following a decomposition reaction in which source of energy for decomposition is light: (a) 2FeSO4 → Fe203+ SO2+ SO3 (b) 2H2O → 2H2+ O2 (c) 2AgBr → 2Ag + Br2 (d) CaCO3 → CaO + CO2

Answer: (c) 2AgBr → 2Ag + Br2

3. A metal and a non-metal that exists in liquid state at the room temperature are respectively : (a) Bromine and Mercury (b) Mercury and lodine (c) Mercury and Bromine (d) Iodine and Mercury

Answer: (c) Mercury and Bromine

4. Carbon compounds: (i) are good conductors of electricity. (ii) are bad conductors of electricity. (iii) have strong forces of attraction between their molecules. (iv) have weak forces of attraction between their molecules.

The correct statements are: (a) (i) and (ii) (b) (ii) and (iii) (c) (ii) and (iv) (d) (i) and (iii)

Answer: (d) (i) and (iii)

5. Consider the following compounds : FeSO4; CuSO4; CaSO4; Na2CO3

The compound having maximum number of water of crystallisation in its crystalline form in one molecule is : (a) FeSO4 (b) CuSO4 (c) CaSO4 (d) Na2CO3

Answer: (d) Na2CO3 ; 10 water molecules

6. Oxides of aluminium and zine are : (a) acidic (b) basic (c) amphoteric (d) neutral

Answer: (c) amphoteric; behave as both acidic and basic oxides

7. MnO2 + 4HCI → MnCl2 + 2H2O + Cl2 The reaction given above is a redox reaction because in this case (a) MnO2 is oxidised and HCI is reduced. (b) HCI is oxidised. (c) MnO2 is reduced. (d) MnO2 is reduced and HCI is oxidised.

Answer: (d) MnO2 is reduced and HCI is oxidised; MnO2 loses its oxygen to form MnCl2 and HCl loses its H to form Cl2.

8. Consider the following statements (i) The sex of a child is determined by what it inherits from the mother. (ii) The sex of a child is determined by what it inherits from the father. (iii) The probability of having a male child is more than that of a female child. (iv) The sex of a child is determined at the time of fertilisation when male and female gametes fuse to form a zygote. The correct statements are : (a) (i) and (iii) (b) (ii) and (iv) (c) (iii) and (iv) (d) i), (iii) and (iv)

Answer: (b) (ii) and (iv)

9. Chromosomes : (i) carry hereditary information from parents to the next generation. (ii) are thread like structures located inside the nucleus of an animal cell. (iii) always exist in pairs in human reproductive cells. (iv) are involved in the process of cell division.

The correct statements are : (a) (i) and (ii) (b) (iii) and (iv) (a) (i), (ii) and (iv) (d) (i) and (iv) Answer: (a) (i) and (ii)

10. In a nerve cell, the site where the electrical impulse is converted into a chemical signal is known as : (a) Axon (b) Dendrites (c) Neuromuscular junction (d) Cell body

Answer: (c) Neuromuscular junction; a neuromuscular junction (or myoneural junction) is a chemical synapse between a motor neuron and a muscle fiber.

11. A stomata closes when: (i) it needs carbon dioxide for photosynthesis. (ii) it does not need carbon dioxide for photosynthesis. (iii) water flows out of the guard cells. (iv) water flows into the guard cells. The correct reason(s) in this process is/are : (a) (i) only (b) (i) and (iii) (c) (ii) and (iii) (d) (ii) and (iv) Answer: (c) (ii) and (iii);

12. At what distance from a convex lens should an object be placed to get an image of the same size as that of the object on a screen?

(a) Beyond twice the focal length of the lens. (b) At the principal focus of the lens. (c) At twice the focal length of the lens. (d) Between the optical centre of the lens and its principal focus.

Answer: (c) At twice the focal length of the lens;

13. The lens system of human eye forms an image on a light sensitive screen, which is called as: (a) Cornea (b) Ciliary muscles (c) Optic nerves (d) Retina Answer: (d) Retina

Class 10 Science Question Paper 2024 PDF Download

On March 02, 2024, the Central Board of Secondary Education successfully conducted the Class 10th Science Exam 2024. The CBSE Class 10th Science Question Paper was for a total of 100 marks out of which 80 marks were for the theory exam and the rest 20 marks were for the internal assessments. The CBSE Board Question Papers are valuable resources as after the successful conduction of the exam, these question papers help the students to evaluate their performance in the exams. They also give an overview of papers to students preparing to appear in the class 10th exams next year of the types. To download the CBSE Class 10 Science Question Paper 2024 set 1, 2, and 3 PDF, the direct link has been updated below:

Class 10 Science Answer Key 2024 PDF Download

The Central Board of Secondary Education successfully conducted the CBSE Board Class 10th Science Examination today i.e., March 02, 2024. Students who appeared in the examination can able to check the complete CBSE Class 10 Science Answer Key PDF 2024 for all the sets from the direct link that has been shared in the article below. To help the students, a CBSE Class 10 Science Answer Key 2024 designed by our expert faculty has been shared with students in the article here.

CBSE Class 10 Science Exam Analysis 2024

All the students who appeared in the Class 10 Science Exam 2024 for SET 1, 2, 3, can check the live Class 10 Science Exam Analysis 2024 by Sankalp Bharat Foundation. Watch the video.

CBSE Class 10 Science Exam Paper Analysis 2024

Most of the students who appeared for the CBSE Class 10 Science Exam today i.e., March 02, 2024 found the paper a bit easy and well-structured. Students have mentioned that all questions were based on the syllabus and followed the same format as the latest CBSE class 10th Science sample paper 2024. Overall it was a standard paper, based on the NCERT syllabus and easy for the students who have practised through the sample papers. The CBSE class 10 Science exam analysis shared here is entirely based on the review of the paper shared by students and expert educators.

Vigyata said she was nervous before the science paper but now she is very happy as the paper went very well.

Ansh also reiterated that it was not a lengthy paper except for some questions that needed more Comprehension.

Some of the general views of the students have been shared below:

The overall Difficulty Level of the CBSE Class 10th Science Question paper 2024 was Moderate to Easy.
All questions were based on the latest syllabus and followed the pattern of the CBSE sample paper.
MCQs were mostly average and needed conceptual knowledge.
Case-based questions were easy to moderate.
No question was found to be outside of the syllabus.
About 60-70% of the questions were straight from the textbook.
When students were asked whether the Paper was Lengthy? They replied that Yes, the paper was lengthy but manageable.

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CBSE Class 10 Science Answer Key 2024: FAQs

Q1. what is the exam date for cbse class 10th science exam 2024.

Ans: The CBSE Class 10th science exam 2024 is conducting on March 02, 2024.

Q2. Where can I check the complete CBSE Class 10th science question paper and answer key 2024?

Ans: After the completion of the exam students can check the complete CBSE Class 10th Science question paper and answer key 2024 from our article.

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