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NCERT Class 12 Biology Syllabus
The Biology syllabus for Class 12, prescribed by the National Council of Educational Research and Training (NCERT), is a comprehensive curriculum designed for students preparing for higher education in medical, biotechnology, and life sciences fields. It bridges the gap of knowledge acquired in Class 11 and delves deeper into complex biological processes. The syllabus is divided into five major units covering Reproduction, Genetics, Evolution, Biology in Human Welfare, Biotechnology, and Ecology.
Unit I: Reproduction
This unit constitutes a significant portion of the curriculum and deals with the modes and mechanisms of reproduction in various organisms. It explores how life perpetuates itself through different biological strategies.
Chapter 1: Reproduction in Organisms
- Reproduction: Definition and its significance.
- Asexual reproduction: Modes (Binary fission, sporulation, budding, gemmules, fragmentation; vegetative propagation in plants).
- Sexual reproduction: An overview; Pre-fertilization events (Gametogenesis, gamete transfer); Fertilization; Post-fertilization events (Zygote, embryogenesis).
Chapter 2: Sexual Reproduction in Flowering Plants
- Flower: A fascinating organ of angiosperms; Pre-fertilization: Structure and events (Stamen, Microsporangium, Pollen grain, Pistil, Megasporangium, Ovule).
- Pollination: Types, agencies, and examples (Outbreeding devices).
- Pollen-Pistil Interaction: Events from deposition to fertilization.
- Post-fertilization events: Development of endosperm and embryo; Development of seed and fruit; Special modes (Apomixis, parthenocarpy, polyembryony).
- Significance of seed and fruit formation.
Chapter 3: Human Reproduction
- Male and Female Reproductive Systems: Anatomy and histology.
- Gametogenesis: Spermatogenesis and Oogenesis; Menstrual cycle.
- Fertilization and Embryo Development: Implantation, pregnancy, placenta formation.
- Parturition and Lactation.
Chapter 4: Reproductive Health
- Reproductive Health: Problems and strategies.
- Population explosion and birth control methods.
- Medical Termination of Pregnancy (MTP).
- Sexually Transmitted Infections (STIs): Symptoms, prevention, and management.
- Infertility and assisted reproductive technologies (IVF, ZIFT, IUT).
Unit II: Genetics and Evolution
This unit is fundamental to understanding biological inheritance and the changes occurring in living organisms over generations. It integrates principles of heredity with molecular biology.
Chapter 5: Principles of Inheritance and Variation
- Mendels Laws of Inheritance.
- Inheritance of one gene (Monohybrid Cross) and two genes (Dihybrid Cross).
- Sex determination in humans, birds, and honey bees.
- Genetic disorders: Mendelian disorders (Hemophilia, Sickle-cell anemia, Color blindness); Chromosomal disorders (Downs syndrome, Turners syndrome, Klinefelters syndrome).
Chapter 6: Molecular Basis of Inheritance
- The DNA: Structure of polynucleotide chain; Packaging of DNA (Nucleosome).
- Search for Genetic Material: Griffiths experiment, Hershey-Chase experiment, etc.
- Properties of genetic material (DNA vs RNA).
- Central Dogma of Molecular Biology.
- DNA Replication.
- Transcription: Processing of mRNA (Capping, Tailing, Splicing).
- Genetic Code and Translation.
- Regulation of Gene Expression (Lac Operon).
- Genome and Human Genome Project.
- DNA Fingerprinting.
Chapter 7: Evolution
- Origin of life: Abiogenesis theory and Biogenesis.
- Evolution of life forms: Origin and evolution of man.
- Theories of Evolution: Lamarckism, Darwinism, and Modern Synthetic Theory of Evolution.
- Hardy-Weinberg principle; Factors affecting it.
- Evidence for Evolution: Paleontology, Comparative anatomy, Embryology, Molecular evidence.
- Adaptive Radiation: Biological evolution (Examples of Darwins finches).
- Mechanism of Evolution: Natural Selection, Genetic Drift, Gene flow.
- Biological Evolution: Origin and Evolution of Man.
Unit III: Biology in Human Welfare
This unit highlights the application of biological principles for the betterment of human health and agriculture. It connects biology with everyday life.
Chapter 8: Human Health and Disease
- Pathogens, Parasites causing human diseases (Malaria, Filariasis, Ascariasis, Typhoid, Pneumonia, Common cold, Amoebiasis, Ringworm).
- Basic concepts of immunology: Vaccines, Immune response, Immune system in the body.
- Autoimmunity, Allergies.
- AIDS, Cancer.
- Drugs and alcohol abuse: Adolescence and drug/Alcohol abuse, Prevention and management.
Chapter 9: Strategies for Enhancement in Food Production
- Animal Husbandry: Dairy farm management, Poultry farm management, Bee keeping, Fishery management.
- Plant Breeding: Tissue culture, Somatic hybridization, Single cell protein, Biofortification.
Chapter 10: Microbes in Human Welfare
- Microbes in household products (Yogurt, Curd).
- Microbes in industrial products (Fermented beverages, Antibiotics, Chemicals, Enzymes).
- Microbes in sewage treatment.
- Microbes in production of biogas.
- Microbes as biocontrol agents and biofertilizers.
Unit IV: Biotechnology
Biotechnology is the use of living systems and organisms to develop or make products. This unit introduces students to the modern techniques and applications of this technology.
Chapter 11: Biotechnology: Principles and Processes
- Genetic Engineering (Recombinant DNA Technology).
- Tools of Recombinant DNA Technology: Restriction Enzymes, Plasmid vectors, Competent host, Ligases.
- Processes of Recombinant DNA Technology: Isolation of DNA, Fragmentation, Amplification, Ligation, Insertion, etc.
Chapter 12: Biotechnology and its Applications
- Biotechnological Applications in Agriculture: Bt Cotton, Pest Resistant Plants, RNA Interference.
- Biotechnological Applications in Medicine: Genetically Engineered Insulin, Gene Therapy, Molecular Diagnosis, ELISA.
- Transgenic Animals.
- Ethical Issues in Biotechnology.
Unit V: Ecology and Environment
This unit focuses on the interaction of organisms with each other and their physical surroundings. It is crucial for understanding environmental conservation and biodiversity.
Chapter 13: Organisms and Populations
- Organisms and environment: Habitat, niche, Ecological adaptations.
- Populations: Attributes (Natality, Mortality), Population growth models, Population interactions (Mutualism, Competition, Predation, Parasitism).
Chapter 14: Ecosystem
- Ecosystem: Types, Structure, and function.
- Energy flow through the ecosystem (Productivity, Decomposition).
- Ecological Pyramids (Number, Biomass, Energy).
- Ecosystem services (Carbon, Nitrogen, Phosphorus cycles).
Chapter 15: Biodiversity and Conservation
- Biodiversity: Types (Alpha, Beta, Gamma), Importance, Loss of biodiversity.
- Biodiversity Conservation: In-situ (Biosphere reserves, National parks) and Ex-situ (Zoological parks, Cryopreservation).
Chapter 16: Environmental Issues
- Air pollution and its control.
- Water pollution and its control.
- Solid waste management.
- Agrochemicals and their effects.
- Radioactive waste management.
- Greenhouse effect and global warming; Ozone depletion.
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