CBSE Science Syllabus for Class 10 2021-22 sessions (Subject code 086)

Revised Syllabus for Academic Session 2021-22

As per the new Assessment policy, the CBSE has divided the syllabus into two parts – namely, term 1 and term 2 with equal weightage for term 1 and term 2 exams. The syllabus has been reduced for the convenience of the students. 


Click here for the new Assessment policy of CBSE


General Instructions:

  • The total Theory Examinations (Term I+II) will be of 80 marks and 20 marks weightage shall be for Internal Assessment (Term I+II).
  • Internal Assessment – Maximum Marks 10 for each Term:


The marks allocation and evaluation details of the written paper and internal assessment for the Science Paper of class 10 is as follows-


Evaluation Scheme
Units Term I Marks
I Chemical Substances-Nature and Behaviour: Chapter 1,2 and 3 16
II World of Living – Chapter 6 13
III Natural Phenomena Chapter 10 and 11 14
Units Term I Marks
I Chemical Substances-Nature and Behaviour: Chapter 4 and 5 10
II World of Living: Chapter 8 and 9 13
IV Effects of Current: Chapter 12 and 13 1 12
V Natural Resources: Chapter 15 05
Total Theory (Term I + II) 80
Internal Assessment: Term I 10
Internal Assessment: Term II 10


Term I

Theme: Materials
Unit I: Chemical Substances – Nature and Behaviour
Chapter -1 Chemical reactions and equations
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.

Chapter – 2 Acids, Bases and Salts
Acids, bases and salts: Their definitions in terms of furnishing of H+ and OH- ions, General properties, examples and uses, concept of pH scale (Definition relating to logarithm not required), importance of pH in everyday life; preparation and uses of Sodium Hydroxide, Bleaching powder, Baking soda, Washing soda and Plaster of Paris.

Chapter – 3 Metals and non – metals
Metals and nonmetals: Properties of metals and non-metals; Reactivity series; Formation and
properties of ionic compounds.

Theme: The World of the Living
Unit II: World of Living
Chapter – 6 Life processes
Life processes: ‘Living Being’. Basic concept of nutrition, respiration, transport and excretion in plants and animals.

Theme: How Things Work
Unit III: Natural Phenomena
Chapter – 10 Light – Reflection and Refraction
Reflection of light by curved surfaces; Images formed by spherical mirrors, centre of curvature, principal axis, principal focus, focal length, mirror formula (Derivation not required), magnification. Refraction; Laws of refraction, refractive index.
Refraction of light by spherical lens; Image formed by spherical lenses; Lens formula (Derivation not required); Magnification. Power of a lens.

Chapter – 11 Human eye and colourful world
Refraction of light through a prism, dispersion of light, scattering of light, applications in daily life


Term II 

Theme: Materials
Unit I: Chemical Substances – Nature and Behaviour
Chapter – 4 Carbon and its compounds
Carbon compounds: Covalent bonding in carbon compounds. Versatile nature of carbon. Homologous series.

Chapter – 5 Periodic classification of elements
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.

Theme: The World of the Living
Unit II: World of Living
Chapter – 8 How do organisms reproduce?
Reproduction: Reproduction in animals and plants (asexual and sexual) reproductive health-need and methods of family planning. Safe sex vs HIV/AIDS.Child bearing and women’s health.

Chapter – 9 Heredity and Evolution
Heredity: Heredity; Mendel’s contribution– Laws for inheritance of traits: Sex determination: brief introduction;

Theme: Natural Phenomena
Unit IV: Effects of Current
Chapter – 12 Electricity
Ohm’s law; Resistance, Resistivity, Factors on which the resistance of a conductor depends. Series
combination of resistors, parallel combination of resistors and its applications in daily life. Heating
effect of electric current and its applications in daily life. Electric power, Interrelation between P, V, I
and R.

Chapter – 13 Magnetic effects of current
Magnetic effects of current: Magnetic field, field lines, field due to a current carrying conductor, field due to current carrying coil or solenoid; Force on current carrying conductor, Fleming’s Left Hand Rule, Electric Motor, Electromagnetic induction. Induced potential difference, Induced current.
Fleming’s Right Hand Rule.

Theme: Natural Resources
Unit V: Natural Resources
Chapter – 15 Our Environment
Our environment: Eco-system, Environmental problems, Ozone depletion, waste production and their
solutions. Biodegradable and non-biodegradable substances




Note: Learners are assigned to read the below listed part of Unit V. They can be encouraged to
prepare a brief write up on any one concept of this Unit in their Portfolio. This may be an
assessment for Internal Assessment and credit may be given (Periodic assessment/Portfolio).
This portion of the Unit is not to be assessed in the year-end examination.

Chapter – 16 Management of natural resources: Conservation and judicious use of natural
resources. Forest and wildlife; Coal and Petroleum conservation.Examples of people’s participation for
conservation of natural resources. Big dams: advantages and limitations; alternatives, if any. Water
harvesting. .Sustainability of natural resources.



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:
  1. Dilute Hydrochloric Acid
  2. Dilute NaOH solution
  3. Dilute Ethanoic Acid solution
  4. Lemon juice
  5. Water
  6. Dilute Hydrogen Carbonate solution
  1. Studying the properties of acids and bases (HCl & NaOH) on the basis of their reaction with:

    1. Litmus solution (Blue/Red)
    2. Zinc metal
  • Solid sodium carbonate     Unit–I:(Chapter-2)

  1. Performing and observing the following reactions and classifying them into:

  2. Combination reaction
    B. Decomposition reaction
    C. Displacement reaction
  3. Double displacement reaction
  1. Action of water on quicklime
  2. Action of heat on ferrous sulphate crystals
  3. Iron nails kept in copper sulphate solution
  4. Reaction between sodium sulphate and barium chloride solutions.  Unit-I:(Chapter-1)

  1. A. Observing the action of Zn, Fe, Cu and Al metals on the following salt solutions:
  1. ZnSO4(aq)
  2. FeSO4(aq)
  3. (iii)CuSO4(aq)
  4. Al2 (SO4)3(aq)
  1. Arranging Zn, Fe, Cu and Al (metals) in the decreasing order of reactivity based on the above result. Unit-I :(Chapter-3)
  2. Experimentally show that carbon dioxide is given out during respiration.


  1. Determination of the focal length of (i) Concave mirror and (ii) Convex lens by obtaining the

image of a distant object. Unit-III:(Chapter- 10)

  1. 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:(Chapter-10)

  1. Tracing the path of the rays of light through a glass prism. Unit-III:(Chapter-11)




  1. Studying the dependence of potential difference (V) across a resistor on the current (I) passing through it and determining its resistance. Also plotting a graph between V and I.  



  1. Studying (a) binary fission in Amoeba, and (b) budding in yeast and Hydra with the help of prepared slides.                                             Unit-II:(Chapter-8)


Prescribed Books
∙ Science-Text book for class X- NCERT Publication
∙ Assessment of Practical Skills in Science- Class X- CBSE Publication
∙ Laboratory Manual-Science-Class X, NCERT Publication
∙ Exemplar Problems Class X – NCERT Publication


Assessment Areas (Theory) 2021-22

Theory Total Maximum Marks: 80

Competencies Marks
Demonstrate Knowledge and Understanding 46%
Application of Knowledge/Concepts 22%
Analyze, Evaluate and Create 32%



  • Internal choice would be provided.

Internal Assessment – Term I and II (10 Marks each)

  • Periodic Assessment – 03 marks
  • Multiple Assessment – 02 marks
  • Subject Enrichment (Practical Work) – 03 marks
  • Portfolio – 02 mark