CBSE Class 10 Science Revised Syllabus 2021-22

CBSE Class 10 Science Revised Syllabus 2021-22

CBSE Syllabus for Class 10 Science for 2021-2022

 (Annual Examination)                                                                                                                                  Marks: 80

Unit No.UnitMarksPeriods
IChemical Substances-Nature and Behaviour2555
IIWorld of Living2350
IIINatural Phenomena1223
IVEffects of Current1332
VNatural Resources0720
 Internal Assessment20 
 Grand Total100 
CBSE Class 10 Revised Syllabus 2020-21 Download in PDF

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CBSE Class 10 Revised Syllabus 2021-22 Download in PDF

Theme: Materials (55 Periods)

Unit I: Chemical Substances – Nature and Behaviour

  • Chemical reactions: Chemical equation, Balanced chemical equation, implications of a balanced chemical equation, types of chemical reactions: combination, decomposition, displacement, double displacement, precipitation, neutralization, oxidation and reduction.
  • Acids, bases and salts: Definitions in terms of furnishing of H+ and OH– ions, general properties, examples and uses, the concept of pH scale, the importance of pH in everyday life; preparation and uses of Sodium Hydroxide, Bleaching powder, Baking soda, Washing soda and Plaster of Paris.
  • Metals and nonmetals: Properties of metals and non-metals; Reactivity series; Formation and properties of ionic compounds; Basic metallurgical processes; Corrosion and its prevention.
  • Carbon compounds: Covalent bonding in carbon compounds. Versatile nature of carbon. Homologous series. Nomenclature of carbon compounds containing functional groups (halogens, alcohol, ketones, aldehydes, alkanes and alkynes), the difference between saturated hydrocarbons and unsaturated hydrocarbons. Chemical properties of carbon compounds (combustion, oxidation, addition and substitution reaction). Ethanol and Ethanoic acid (only properties and uses), soaps and detergents.
  • Periodic classification of elements: Need for classification, early attempts at classification of elements (Dobereiner’s Triads, Newland’s Law of Octaves, Mendeleev’s Periodic Table), Modern periodic table, gradation in properties, valency, atomic number, metallic and non-metallic properties.

CBSE Class 10 Revised Syllabus 2021-22| Download in PDF

CBSE Class 9th Science Syllabus click

 Theme: The World of the Living                                                                                              (50 Periods)

Unit II: World of Living

Life processes: The basic processes of nutrition, respiration, transport and excretion are essential for the survival of living beings.

Control and co-ordination in animals and plants: Tropic movements in plants, plant hormones, nervous system in animals, voluntary, involuntary and reflex actions, and animal hormones play important roles in control and co-ordination in living organisms.

Reproduction: Reproduction in animals and plants, including asexual and sexual reproduction, reproductive health, family planning, safe sex, HIV/AIDS, childbearing and women’s health, are important aspects of living organisms.

Heredity and Evolution: Understanding the principles of heredity and the contributions of Mendel, sex determination, and the basic concepts of evolution are important for understanding the diversity of life on Earth.

Theme: Natural Phenomena                                                                                                      (23 Periods)

Unit III: Natural Phenomena

This topic covers the behavior of light when it interacts with different materials and surfaces. It includes the reflection of light by curved surfaces, the formation of images by spherical mirrors, and the functioning of lenses in the human eye.

Refraction and its laws, as well as the refractive index, are also discussed. The image formation by spherical lenses, lens formula, magnification, and power of lenses are other important concepts covered.

Defects of vision and their corrections are explained, along with the applications of spherical mirrors and lenses. Finally, the refraction of light through a prism, dispersion of light, scattering of light, and their applications in daily life are discussed.

Theme: How Things Work                                                                                                           (32 Periods)

Unit IV: Effects of Current

Electric current: definition, electric potential difference and its unit, electric resistance and its unit. Ohm’s law and its applications, factors on which the resistance of a conductor depends.

Series and parallel combination of resistors, their properties and applications in daily life. Heating effect of electric current and its applications.

Electric power: definition, its unit, and the interrelation between P, V, I and R.

Magnetic effects of current: magnetic field, field lines, and field due to a current-carrying conductor. Magnetic force on a current-carrying conductor and Fleming’s Left-Hand Rule. Applications of magnetic force in electric motors.

Electromagnetic induction: Faraday’s laws of electromagnetic induction, induced potential difference, and induced current. Lenz’s Law and its application. Fleming’s Right-Hand Rule. Electric generators and their working principle.

Alternating current (AC) and direct current (DC): definitions, advantages of AC over DC, frequency of AC, and domestic electric circuits.

Theme: Natural Resources                                                                                                          (20 Periods)

Unit V: Natural Resources

Sources of energy: Different forms of energy, conventional and non-conventional sources of energy: Fossil fuels, solar energy, wind energy, hydro energy, geothermal energy, and bio-energy. Renewable versus non-renewable sources of Energy. Energy conservation and its importance.

Our environment: Introduction to ecosystem and its components, food chains and food webs. Environmental problems: air pollution, water pollution, soil pollution, noise pollution, global warming and climate change. Ozone depletion, waste production and their solutions. Biodegradable and non-biodegradable substances and their impact on the environment.

Management of natural resources: Conservation and judicious use of natural resources, including water, forests, wildlife, coal and petroleum. Examples of people’s participation for conservation of natural resources. Big dams: advantages and limitations; alternatives, if any. Rainwater harvesting and its importance. Sustainable development and sustainable use of natural resources.

CBSE Class 10 Revised Syllabus 2021-22


Practical should be conducted alongside the concepts taught in theory classes


1. A. Finding the pH of the following samples by using pH paper/universal indicator:      Unit-I

(i) Dilute Hydrochloric Acid

(ii) Dilute NaOH solution

(iii) Dilute Ethanoic Acid solution

(iv) Lemon juice

(v) Water

(vi) Dilute Hydrogen Carbonate solution

B. Studying the properties of acids and bases (HCl & NaOH) on the basis of their reaction with:  Unit-I

a) Litmus solution (Blue/Red)

b) Zinc metal

c) Solid sodium carbonate

2. Performing and observing the following reactions and classifying them into:          Unit-I

A. Combination reaction

B. Decomposition reaction

 C. Displacement reaction

D. Double displacement reaction

      (i) Action of water on quicklime

      (ii) Action of heat on ferrous sulphate crystals

      (iii) Iron nails kept in copper sulphate solution

      (iv) Reaction between sodium sulphate and barium chloride solutions

3. Observing the action of Zn, Fe, Cu and Al metals on the following salt solutions:      Unit-I

      i) ZnSO4(aq)

      ii) FeSO4(aq)

      iii) CuSO4(aq)

      iv) Al2 (SO4)3(aq)

 Arranging Zn, Fe, Cu and Al (metals) in the decreasing order of reactivity based on the above result.

 4. Studying the dependence of potential difference (V) across a resistor on the current (I) passing through it and determine its resistance. Also plotting a graph between V and I.      Unit-IV

5. Determination of the equivalent resistance of two resistors when connected in series and parallel. Unit-IV 6. Preparing a temporary mount of a leaf peel to show stomata.                   Unit- II

 7. Experimentally show that carbon dioxide is given out during respiration.            Unit-II

8. Study of the following properties of acetic acid (ethanoic acid):                              Unit- I

      i) Odour

     ii) solubility in water

     iii) effect on litmus

     iv) reaction with Sodium Hydrogen Carbonate

9. Study of the comparative cleaning capacity of a sample of soap in soft and hard water.  Unit- I

10. Determination of the focal length of:                                                                                   Unit-III

     i) Concave mirror

     ii) Convex lens by obtaining the image of a distant object.

11. Tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence. Measure the angle of incidence, angle of refraction, angle of emergence and interpret the result. Unit – III

12. Studying (a) binary fission in Amoeba, and (b) budding in yeast and Hydra with the help of prepared slides.                     Unit-II

13. Tracing the path of the rays of light through a glass prism.                                            Unit-III

14. Finding the image distance for varying object distances in case of a convex lens and drawing corresponding ray diagrams to show the nature of image formed.                                   Unit-III

15. Identification of the different parts of an embryo of a dicot seed (Pea, gram or red kidney bean). Unit-II

NCERT syllabus for class 10 science 


Science-Textbook for class IX-NCERT Publication

 Science-Text book for class X- NCERT Publication

 Assessment of Practical Skills in Science-Class IX – CBSE Publication

 Assessment of Practical Skills in Science- Class X- CBSE Publication

Laboratory Manual-Science-Class IX, NCERT Publication

 Laboratory Manual-Science-Class X, NCERT Publication

 Exemplar Problems Class IX – NCERT Publication

Exemplar Problems Class X – NCERT Publication

CBSE class 10 science paper pattern 2020-21

Assessment Areas (Theory) 2020-21

(Class X) Science (086)                                   Time: 3 hrs.                                        Maximum Marks: 80 Marks

Demonstrate Knowledge and Understanding46 %
Application of Knowledge/Concepts22 %
Analyze, Evaluate and Create32 %
CBSE Class 10 Revised Syllabus 2020-21 Download in PDF


Typology of Questions: VSA including objective type questions, Assertion – Reasoning type questions;SA; LA; Source-based/ Case-based/ Passage-based/ Integrated assessment questions. 

An internal choice of approximately 33% would be provided.

Internal Assessment (20 Marks) 

Periodic Assessment – 05 marks + 05 marks

Subject Enrichment (Practical Work) – 05 marks

Portfolio – 05 marks

Suggestive verbs for various competencies 

Demonstrate Knowledge and Understanding

State, name, list, identify, define, suggest, describe, outline, summarize, etc. 

Application of Knowledge/Concepts

Calculate, illustrate, show, adapt, explain, distinguish, etc.

 Analyze, Evaluate and Create

 Interpret, analyze, compare, contrast, examine, evaluate, discuss, construct, etc.

Prepare your exam with School Connect Online with Practice Notes,Questions,Shared Vidoes,NCERT Solutions,Mock Tests and Performance Report

Reference Links-

Download Deleted Topics in Class 10th Maths Syllabus 2020-21

Download Deleted Topics in Class 10th Social Science Syllabus 2020-21

Download Class 10 CBSE Maths revised Syllabus 2020-21

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