CBSE Class 12th Biology Unit wise Weightage
|Unit VII||Genetics and Evolution||18|
|Unit VIII||Biology and Human Welfare||14|
|Unit IX||Biotechnology and its Applications||10|
|Unit X||Ecology and Environment||14|
Last 5 Year Question Paper of CBSE Class 12 Biology (Download Now )
|1.||CBSE Class 12 Biology Question Paper 2019 Set 1||Click Here|
|2.||CBSE Class 12 Biology Question Paper 2019 Set 2||Click Here|
|3.||CBSE Class 12 Physics Question Paper 2019 Set 3||Click Here|
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|6.||CBSE Class 12 Biology Question Paper 2018 Set 1||Click Here|
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|11.||CBSE Class 12 Biology Question Paper 2013 Set 1||Click Here|
Biology CBSE Class 12th Syllabus
Chapter-1: Reproduction in Organisms
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.
Chapter-2: Sexual Reproduction in Flowering Plants
Flower structure; development of male and female gametophytes; pollination – types, agencies
and examples; outbreeding devices; pollen-pistil interaction; double fertilization; post
fertilization events – development of endosperm and embryo, development of seed and formation
of fruit; special modes- apomixis, parthenocarpy, polyembryony; Significance of seed dispersal
and fruit formation.
Chapter-3: Human Reproduction
Male and female reproductive systems; microscopic anatomy of testis and ovary; gameto,genesisspermatogenesis and oogenesis; menstrual cycle; fertilisation, embryo development upto blastocyst formation, implantation; pregnancy and placenta formation (elementary idea);
parturition (elementary idea); lactation (elementary idea).
Chapter-4: Reproductive Health
Need for reproductive health and prevention of Sexually Transmitted Diseases (STDs); birth
control – need and methods, contraception and medical termination of pregnancy (MTP);
amniocentesis; infertility and assisted reproductive technologies – IVF, ZIFT, GIFT (elementary
idea for general awareness).
Unit-VII Genetics and Evolution
Chapter-5: Principles of Inheritance and Variation
Heredity and variation: Mendelian inheritance; deviations from Mendelism – incomplete
dominance, co-dominance, multiple alleles and inheritance of blood groups, pleiotropy;
elementary idea of polygenic inheritance; chromosome theory of inheritance; chromosomes and
genes; Sex determination – in human being, birds and honey bee; linkage and crossing over; sex
linked inheritance – haemophilia, colour blindness; Mendelian disorders in humans -thalassemia;
chromosomal disorders in humans; Down’s syndrome, Turner’s and Klinefelter’s syndromes.
Chapter-6: Molecular Basis of Inheritance
Search for genetic material and DNA as genetic material; Structure of DNA and RNA; DNA
packaging; DNA replication; Central Dogma; transcription, genetic code, translation; gene
expression and regulation – lac operon; Genome, Human and rice genome projects; DNA
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-8: Human Health and Diseases
Pathogens; parasites causing human diseases (malaria, dengue, chikungunya, filariasis,
ascariasis, typhoid, pneumonia, common cold, amoebiasis, ring worm) and their control; Basic
concepts of immunology – vaccines; cancer, HIV and AIDS; Adolescence – drug and alcohol
Chapter-9: Strategies for Enhancement in Food Production
Animal husbandry, Plant breeding, tissue culture, single cell protein.
Chapter-10: Microbes in Human Welfare
Microbes in food processing, industrial production, sewage treatment, energy generation and microbes as bio-control agents and bio-fertilizers. Antibiotics; production and judicious use.
Unit-IX Biotechnology and its Applications
Chapter-11: Biotechnology – Principles and Processes
Genetic Engineering (Recombinant DNA Technology).
Chapter-12: Biotechnology and its Application
Application of biotechnology in health and agriculture: Human insulin and vaccine production,
stem cell technology, gene therapy; genetically modified organisms – Bt crops; transgenic
animals; biosafety issues, biopiracy and patents.
Unit-X Ecology and Environment
Chapter-13: Organisms and Populations
Organisms and environment: Habitat and niche, population and ecological adaptations;
population interactions – mutualism, competition, predation, parasitism; population attributes –
growth, birth rate and death rate, age distribution.
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-15: Biodiversity and its Conservation
Biodiversity – Concept, patterns, importance; loss of biodiversity; biodiversity conservation;
hotspots, endangered organisms, extinction, Red Data Book, Sacred Groves, biosphere reserves,
national parks, wildlife, sanctuaries and Ramsar sites.
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; case study exemplifying success
story addressing environmental issue(s).