Biology Syllabus; Class-X

General Instructions :

  1. There will be an Annual examination based on entire syllabus
  2. The annual examination will be of 80 marks and 20 marks weightage shall be for
    internal assessment
  3. Out of 80 marks annual examination, 68 marks weightage shall be for theory and
    12 marks weightage shall be for practical based questions.
  4. For internal assessment
    1. There will be three periodic tests conducted by the school. Average of the best two tests to be taken that will have a weightage of 10 marks towards the final result.
    2. Practical / Laboratory work should be done throughout the year and the
      student should maintain record of the same. Practical Assessment should be
      continuous. There will be weightage of 5 marks towards the final result. All
      practicals listed in the syllabus must be completed.
    3. Regularity, class work and home assignment completion along with neatness
      and upkeep of notebook will carry a weightage of 5 marks towards the final

Course Structure Class – X
(Annual Examination)


Maximum Marks=80

Unit No.




Chemical Substances – Nature and Behaviour



World of Living



Natural Phenomena



Effects of Current



Natural Resources




Internal Assessment


Grand Total


Note : Above weightage includes the weightage of questions based on practical skills.

Theme : The World of the Living

Unit II : World of Living (50 Periods)

Life processes: ‘Living Being’. Basic concept of nutrition, respiration, transport
and excretion in plants and animals.
Control and co-ordination in animals and plants: Topic movements in plants;
Introduction of plant hormones; Control and co-ordination in animals; Nervous
system; Voluntary, involuntary and reflex action; Chemical co-ordination: animal
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.
Heredity and Evolution: Heredity; Mendel’s contribution – Laws for inheritance
of traits : Sex determination : brief introduction; Basic concepts of evolution.

Theme : Natural Resources

Unit V : Natural Resources (20 Periods)

Sources of energy: Different forms of energy, conventional and non-conventional
sources of energy: Fossil fuels, solar energy; biogas; wind, water and tidal energy;
Nuclear energy. Renewable versus non-renewable sources of Energy.
Our environment: Eco-system, Environmental problems, Ozone depletion, waste
production and their solutions. Biodegradable and non-biodegradable substances.
Management of natural resources: Conservation and judicious use of natural
resources. Forest and wild life; 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


Practicals should be conducted alongside the concepts taught in theory classes.
List of Experiments

  1. Preparing a temporary mount of a leaf peel to show stomata.
  2. Experimentally show that carbon dioxide is given out during respiration.
  3. Studying (a) binary fission in Amoeba, and (b) budding in yeast with the help of
    prepared slides.
  4. Identification of the different parts of an embryo of a dicot seed (Pea, gram or red
    kidney bean).


Prescribed Books

Science – Textbook 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


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