CBSE Class 12th Biology Syllabus

Class-12th-Biology-Syllabus

Deleted Topics from CBSE 12th Biology Syllabus 2020-21:

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.

Unit-VIII Biology and Human Welfare

Chapter 9: Strategies for Enhancement in Food Production

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

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 a success story addressing environmental issue(s).

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