CBSE Class 12 Biology Board Exam 2020: Most Important Topics

CBSE Class 12 Biology board exam 2020 is scheduled for 14th March 2020. In this article, you will get complete list of topics which are expected to be asked in Class 12 Biology board exam 2020.

CBSE Class 12 Biology Board Exam 2020: Most Important Topics
CBSE Class 12 Biology Board Exam 2020: Most Important Topics

Learn about important topics from which questions can be asked in CBSE Class 12 Biology Board Exam 2020. As, per CBSE Date Sheet 2020, Class 12 Biology paper is scheduled to be held on 14th March 2020. 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 2020. 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.

Complete details related to important topics from which questions which can be asked in CBSE Class 12 Biology board exam 2020 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

Jagran Play
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