CBSE Class 12 Biology Syllabus for Board Exam 2023 with Important Resources for Last Minute Preparation

Biology Syllabus Class 12 2022 - 2023: CBSE Class 12 Biology Syllabus 2022-23 can be downloaded in PDF format in the article below. You will find here the Revised Course structure, course content & Examination Scheme for both Theory and Practical exams. Check the syllabus here and note important topics to be studied. 


Get CBSE Class 12 Biology New Syllabus
Get CBSE Class 12 Biology New Syllabus

Biology Syllabus Class 12 2022 - 2023:  Check CBSE Class 12 Biology Syllabus 2022-23 in the article here. This is the revised syllabus based on which the CBSE Class 12 Biology Board Exam 2023 will be conducted.  You can not only view the complete syllabus here but also download it. A certain portion of the syllabus was removed for the 2022-2023 academic session. Therefore, students must be aware of the deleted portion of the syllabus that will not be assessed in the CBSE Board Exam 2023.

CHECK: CBSE Class 12 Biology DELETED Syllabus 2022-23 to know the chapter-wise list of topics that will not be tested in the exam tomorrow.

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CBSE Class 12 Biology Syllabus 2022-23 

Check the complete syllabus below along with the new exam scheme

CBSE Class 12 Biology Syllabus: Course Structure








Genetics and Evolution



Biology and Human Welfare



Biotechnology and its Applications



Ecology and Environment


Related: CBSE Class 12 Biology Sample Paper for Board Exam 2023

CBSE Class 12 Biology Syllabus: Course Content

Unit-6 Reproduction

Chapter- 2: Sexual Reproduction in Flowering Plants

Flower structure; development of male and female gametophytes; pollination - types, agencies and examples; out breeding 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 and oogenesis; menstrual cycle; fertilisation, embryo development up to 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-7 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 and honey bees; 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 fingerprinting.

Chapter-7: Evolution

Origin of life; biological evolution and evidence for biological evolution (palaeontology, 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-8 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 and microbes as bio-control agents and bio-fertilizers. Antibiotics; production and judicious use.

Unit-9 Biotechnology and its Applications

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, biopiracy and patents.

Unit-10 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 Abiotic Factors, Responses to Abiotic 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.

Download CBSE Class 12 Biology Syllabus 2022-23 PDF here

Also visit:

CBSE class 12 Biology sample paper 2022-23

NCERT Books for Class 12 Biology ALL Chapters


All the best!


When is CBSE Class 12 Biology board examination 2022-23?

CBSE Board datesheet for class 12 board examination has not been outyeat. However, the boards are expected to start in the mid of February 2023.Thus, CBSE Class 12 Biology examination could be, expectedly, kept in February end or March beginning 2023.

When is CBSE Class 12 Biology practical Exam 2022-23 going to be conducted?

CBSE Board has not released the dates for the upcoming practical or theory examinations for CBSE Class 12 Board Exams 2022-23. However, CBSE Class 12 Biology practical 2022-23 could be held in the month of January 2023.

Is there any change in CBSE class 12 Biology syllabus 2022 2023?

Yes, the CBSE class 12 Biology syllabus 2022 2023 has undergone rationalisation and the current syllabus has been presented in this article. You can also download the latest syllabus pdf. You can also double check using the list of DELETED topics from CBSE Class 12 Biology syllabus for the academic session from this article.

Where can I download CBSE Class 12 Biology Syllabus 2022-23?

You can download CBSE Class 12 Biology Syllabus for 2022-23 session in PDF Format from this article in Jagran Josh.
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