CBSE Class 12 Biology Syllabus for 2022-23

On April 21st, 2022, CBSE released a reduced syllabus for classes 9 to 12 of the 2022-23 academic session.

After so many changes in the last 2 to 3 years, CBSE has finalised a reduced syllabus for Class 12 teachers and students to follow. However, the term-based examination pattern will NOT BE FOLLOWED in 2022-23.

We were prompt about the syllabus release and have updated the changes in all the subjects for you. Here, you can find:

  • PDF download links to the latest reduced Class 12 Biology Syllabus for 2022-23 academic session; and
  • simple analysis of all the deleted topics/ chapters to be followed this year.

2022-23 Reduced Syllabus

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We have also provided the syllabus for the 2020-21 session that was previously restored so that you can compare the deleted and added topics.

2020-21 Reduced Syllabus

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Topics Added (✔️) | Topics Deleted ()
❌ Chapter 1 - Reproduction in Organisms
Chapter 2 - Sexual Reproduction in Flowering Plants
Chapter 3 - Human Reproduction
Chapter 4 - Reproductive Health
Chapter 5 - Principles of Inheritance and Variation
Sex determination - in human being, birds, grasshopper and honey bee
Pedigree analysis
Sickle cell anaemia
Chapter 6 - Molecular Basis of Inheritance
Chapter 7 - Evolution
✔️ Origin of life
✔️ Biological evolution and evidence for biological evolution (palaeontology, comparative anatomy, embryology and molecular evidence);
Lamarck’s theory of use and disuse of organs
✔️ Darwin's theory of evolution
✔️ Mechanism of evolution - variation (mutation and recombination) and natural selection with examples
✔️ Types of natural selection
✔️ Gene flow and genetic drift
✔️ Hardy - Weinberg's principle
Brief account of evolution
✔️ Adaptive radiation
✔️ Human evolution.
Chapter 8 - Human Health and Diseases
❌ Chapter 9 - Strategies for Enhancement in Food Production
Chapter 10 - Microbes in Human Welfare
Chapter 11 - Biotechnology - Principles and Processes
Chapter 12 - Biotechnology and its Applications
Chapter 13 - Organisms and Populations
Chapter 14 - Ecosystem
✔️ Ecosystem: structure and function
✔️ Productivity and decomposition
✔️ Energy flow
✔️ Pyramids of number, biomass, energy
Nutrient cycles (carbon and phosphorous)
Ecological succession
✔️ Ecological services - carbon fixation, pollination, seed dispersal, oxygen release (in brief)
Chapter 15 - Biodiversity and Conservation
Chapter 16 - Environmental Issues

Units Unit Name Marks
VI Reproduction 16
VII Genetics and Evolution 20
VIII Biology and Human Welfare 12
IX Biotechnology and its Applications 12
X Ecology and Environment 10
PRACTICALSTwo Experiments (05+04) + Slide Preparation (05) + Spotting (07) +
Investigatory Project, its Record & Viva (05) Practical Record & Viva (04)

List of Practicals

  1. Isolate DNA from available plant material such as spinach, green pea seeds, papaya, etc.
  2. Prepare a temporary mount of onion root tip to study mitosis.
  3. Prepare a temporary mount to observe pollen germination.
  4. <green> Study the plant population density by quadrat method.
  5. <green> Study the plant population frequency by quadrat method.
  6. <green> Prepare a temporary mount of onion root tip to study mitosis.
  7. Collect water from two different water bodies around you and study them for pH, clarity and presence of any living organism.
  8. Collect and study soil from at least two different sites and study them for texture, moisture content, pH and water holding capacity. Correlate with the kinds of plants found in them.
  9. <red> Study the presence of suspended particulate matter in air at two widely different sites. <red>
  10. <red> Study the effect of different temperatures and three different pH on the activity of salivary amylase on starch. <red>


Term I

  1. Flowers adapted to pollination by different agencies (wind, insects, birds).
  2. <red> Pollen germination on stigma through a permanent slide or scanning electron micrograph. <red>
  3. Identification of stages of gamete development, i.e., T.S. of testis and T.S. of ovary through permanent slides (from grasshopper/mice).
  4. Meiosis in onion bud cells or grasshopper testis through permanent slides.
  5. T.S. of the blastula through permanent slides (Mammalian).
  6. <red> Mendelian inheritance using seeds of different colour/ sizes of any plant. <red>
  7. Prepared pedigree charts of any one of the genetic traits such as rolling of tongue, blood groups, ear lobes, widow's peak and color blindness.

Term II

  1. <red> Controlled pollination - emasculation, tagging and bagging. <red>
  2. Common disease causing organisms like Ascaris, Entamoeba, Plasmodium, any fungus causing ringworm through permanent slides, models or virtual images. Comment on symptoms of diseases that they cause.
  3. Two plants and two animals (models/virtual images) found in xeric conditions. Comment upon their morphological adaptations.
  4. Two plants and two animals (models/virtual images) found in aquatic conditions. Comment upon their morphological adaptations.

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