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CBSE Class 12 Biology Board Exam 2018: Most Important Topics

CBSE Class 12 Biology board exam 2018 is scheduled to be held on 27 March. In this article, you will get complete list of topics which are expected to be asked in Class 12 Biology board exam 2018.

Jan 25, 2018 10:25 IST
    CBSE Class 12 Biology Board Exam 2018: Most Important Topics
    CBSE Class 12 Biology Board Exam 2018: Most Important Topics

    Learn about important topics from which questions can be asked in CBSE Class 12 Biology Board Exam 2018. As, per CBSE Date Sheet 2018, Class 12 board exams 2018 will start from 5 March 2018 and Biology paper is scheduled to be held on 27 March 2018. The subject has huge syllabus & now students should focus on revision.

    Here, we have pointed out some important topics from the complete syllabus. There is a huge probability that questions based on these concepts will be asked in CBSE Class 12 Biology board exam 2018. Students preparing for this exam are also advised to go through latest CBSE Class 12 Biology Sample Paper. This paper is recently issued by CBSE. With this Sample Paper, students can easily understand latest blueprint and examination pattern of CBSE Class 12 Biology board exam 2018.

    Complete details related to important topics from which questions which can be asked in CBSE Class 12 Biology board exam 2018 are given below:

    Unit VI Reproduction

    Chapter 1: Reproduction in Organisms

    Modes of reproduction - asexual reproduction & 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

    Gametogenesis-spermatogenesis & oogenesis

    Menstrual cycle: fertilization, embryo development upto blastocyst formation, implantation

    Pregnancy and placenta formation



    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)


    Infertility and assisted reproductive technologies - IVF, ZIFT, GIFT

    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 humans, birds, honey bee

    Linkage and crossing over

    Sex linked inheritance - haemophilia, colour blindness

    Mendelian disorder 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 and human and rice ganeome project

    DNA fingerprinting

    Chapter 7: Evolution

    Biological evolution and evidences for biological evolution (paleontological, comparative anatomy, embryology and molecular evidence)

    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 in Human Welfare

    Chapter 8: Human Health and Disease

    Pathogens: parasites causing human diseases and their control

    Basic concepts of immunology - vaccines: cancer, HIV and AIDs


    Drug and alcohol abuse

    Chapter 9: Strategies for Enhancement in Food Production

    Improvement in food production

    Plant breeding

    Tissue culture

    Single cell protein


    Apiculature and Animal husbandry

    Chapter 10: Microbes in Human Welfare

    Household food processing

    Industrial production

    Sewage treatment

    Energy generation and microbes as biocontrol agents and biofertilizers

    Antibiotics - production and judicious use

    Unit IX Biotechnology

    Chapter 11: Biotechnology: Principles and Processes

    Genetic engineering (Recombinant DNA technology). 

    Chapter 12: Biotechnology and its Applications

    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, bio piracy and patents

    Unit X Ecology

    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

    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

    Chapter 15: Biodiversity and Conservation

    Concept of biodiversity

    Patterns of biodiversity

    Biodiversity conservation


    Endangered organisms

    Red Data Book

    Biosphere reserves, national parks, 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

    Ozone layer depletion


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