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CBSE Class 12 Biology Syllabus: Check Topic-Wise Weightage

Rahul Raj
Rahul RajUpdated On: January 31, 2023 04:40 pm IST

CBSE Board exams for the academic year 2023 will be conducted in single term mode at the end of the session. In the article below, students can find the revised CBSE Class 12th Biology Syllabus for the year 2023.

CBSE Class 12th Biology Syllabus

CBSE Class 12 Biology Syllabus 2023 has been made public by the Central Board of Secondary Education. Utilizing the link provided below, students can obtain the CBSE Class 12 Biology Syllabus for 2022–23. Additionally, they can get the 2022 CBSE 12th Biology syllabus on the website, The units, chapters, and theory exam topics for Class 12 Biology are all included in the CBSE syllabus for 2022, along with information on the practicals. Students can consult the CBSE Class 12 Biology Syllabus 2023 to see the marks assigned for each unit. Students can consult the curriculum in pdf format while they get ready for the CBSE 12th exams.

Students will be able to review the syllabus's significant and high weightage topics and make the necessary preparations for the CBSE Board exams. It will be beneficial to use the CBSE Class 12 Biology Syllabus 2022 for both academic and competitive tests. For information on the CBSE Class 12 biology syllabus, read the entire article.

CBSE Class 12 Exam 2023 Important Links:
CBSE 12th Board 2023
CBSE 12th Admit Card 2023
CBSE 12th Result 2023
CBSE 12th Exam Pattern 2023
CBSE Class 12 Syllabus 2023
CBSE 12th Date Sheet 2023
CBSE 12th Preparation Tips 2023
CBSE Sample Paper 2022-23 Class 12
CBSE Previous Year Question Papers Class 12

CBSE Board Latest Updates 2023

CBSE Class 12 Biology Syllabus 2022-23

The Biology syllabus consists of a total of 5 units. The theory papers are for 70 marks, and the practical tests are worth 30 marks.

Genetics and Evolution20
Biology and Human Welfare12
Biotechnology and its Applications12
Ecology and Environment10

CBSE Class 12 Biology Syllabus 2022-23 Topic Wise

Unit No

Chapter No


Unit-VI Reproduction

Chapter-2: Sexual Reproduction in Flowering Plants

flower structure, male and female gametophyte development, types, agencies, and examples of pollination, outbreeding methods, pollen-pistil interaction, double fertilisation; Post-fertilization processes include the growth of the endosperm and embryo, the development of the seed, and the production of fruit. Special forms include apomixis, parthenocarpy, and polyembryony.

Chapter-3: Human Reproduction

The reproductive systems of men and women, the microscopic anatomy of the testis and ovary, gametogenesis—spermatogenesis and oogenesis—, the menstrual cycle, fertilisation, embryo development up to blastocyst formation, implantation, pregnancy and placenta formation (a basic concept), parturition (a basic concept), and lactation are all covered (elementary idea).

Chapter-4: Reproductive Health

Birth control: techniques, need, and importance; medical termination of pregnancy (MTP); amniocentesis; need for reproductive health and prevention of sexually transmitted diseases (STDs); 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

Mendelian inheritance; pleiotropy; incomplete dominance, co-dominance, multiple alleles, and the inheritance of blood groups; the fundamental concept of polygenic inheritance; the chromosome theory of inheritance; chromosomes and genes; heredity and variation; Human, avian, and honey bee sex determination; linkage and crossing over; sex-related inheritance of haemophilia and colour blindness; Thalassemia, chromosomal diseases in people, Down syndrome, Turner syndrome, and Klinefelter syndrome are examples of Mendelian disorders in people.

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 fingerprinting.

Chapter-7: Evolution

Origin of life; biological evolution and its supporting evidence (palaeontology, 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-principle; Weinberg's adaptive radiation; and 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 abuse.

Chapter-10: Microbes in Human Welfare

Microbes in food processing, industrial production, sewage treatment, energy generation andmicrobes 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 Applications

Biotechnology's use in medicine and agriculture includes the creation of human insulin and vaccines, stem cell research, gene therapy, genetically modified organisms such as Bt crops, transgenic animals, and problems with biosafety, biopiracy, and patents.

Unit-X Ecology and Environment

Chapter-13: Organisms and Populations

Population interactions - mutualism, competition, predation, parasitism; population attributes - growth, birth rate and death rate, age distribution. (Topics excluded: Organism and its Environment, Major Aboitic Factors, Responses to Abioitic Factors, Adaptations)

Chapter-14: Ecosystem

Ecosystems: Patterns, components; productivity and decomposition; energy flow; pyramids of number, biomass, energy (Topics excluded: Ecological Succession and Nutrient Cycles)

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.

CBSE Class 12 Biology Syllabus 2023 for Practical

How to Download CBSE Class 12 Biology Syllabus 2022-23?

To get the CBSE 12th Biology syllabus for 2023 from the official website, follow the instructions below:

  • Step 1 - Go to the official website,
  • Step 2: Select the "Curriculum" link on the homepage.
  • Step 3 - Click on the ‘Senior Secondary Curriculum (XI-XII)’.
  • Step 4 - Select Academic Electives - (Group-A).
  • Step 5 - Select the Biology tab at this point. You'll see the CBSE Class 12 Biology Syllabus 2023 on your displays. The curriculum should be saved as a pdf.

Prescribed Books for CBSE Class 12 Biology

To fulfil the CBSE Class 12 Biology Syllabus 2022–23, NCERT Books for Class 12 Biology were recommended by the CBSE. The NCERT book should always be used as a reference because it explains the complete course in plain English. Each lesson is also accompanied by pertinent diagrams to aid with understanding. The list of books that CBSE recommends is provided below:

  1. Biology, Class-XII, Published by NCERT

  2. Other related books and manuals brought out by NCERT (including multimedia)

  3. Biology Supplementary Material (Revised). available on CBSE website.


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