CBSE syllabus reduced by 30%: Check deleted syllabus of CBSE Class 12

Learn about the deleted topics of CBSE Class 12th Biology Syllabus 2020-21. In this article, you will also find links to access revised CBSE 11th Biology Syllabus 2020-21

Human Resource and Development Minister Ramesh Pokhriyal ‘Nishank’ announced a major reduction in CBSE syllabus 2020-21 by 30 per cent. The Central Board of Secondary Education (CBSE) slashed 30 per cent of the syllabus for the year 2020-21 for classes 9 to 12 because of the reduction in classroom teaching time due to the COVID-19 pandemic and lockdown

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Check Deleted Topics From 12th Biology Syllabus 2020-21

Under Unit-VI Reproduction

Chapter-1: Reproduction in Organism

Reproduction, a characteristic feature of all organisms for continuation of species; modes of reproduction – asexual and sexual reproduction; asexual reproduction – binary fission, sporulation, budding, gemmule formation, fragmentation; vegetative propagation in plants

Under Unit-VII Genetics and Evolution

Chapter-7: Evolution

Origin of life; biological evolution and evidences for biological evolution(paleontology, comparative anatomy, embryology and molecular evidences); Darwin’s contribution, modern synthetic 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; adaptive radiation; human evolution.

Under Unit-VIII Biology and Human Welfare

Chapter 9: Strategies for Enhancement in Food Production

Animal husbandry, Plant breeding, tissue culture, single cell protein.

Under Unit-X Ecology and Environment

Chapter-14: Ecosystem  

Ecosystems: Patterns, components; 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 16: Environmental Issues  

Air pollution and its control; water pollution and its control; agrochemicals and their effects; solid waste management; radioactive waste management; greenhouse effect and climate change impact and mitigation; ozone layer depletion; deforestation; exemplifying case study as success story addressing environmental issue(s).

Check Deleted Topics From 12th Biology Syllabus 2020-21


A: List of Experiments

1. Study the presence of suspended particulate matter in air at two widely different sites.

2. Study the plant population density by quadrat method.

3. Study the plant population frequency by quadrat method.

B. Study/Observer of the following (spotting)

1. Pollen germination on stigma through a permanent slide or scanning electron micrograph.

2. Mendelian inheritance using seeds of different colour/sizes of any plant.

3. Controlled pollination – emasculation, tagging and bagging.

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