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Download CBSE Class 12 Biology Syllabus 2023-24

CBSE Class 12 Biology Syllabus

The Revised CBSE Class 12 Biology Syllabus 2023-24 is announced officially on the website. For the upcoming academic session 2023-24, students need to go through the new CBSE biology syllabus for class 12. 

CA Wizard provides the Revised CBSE Class 12 Biology Syllabus in a pdf format for students to download for free. From this article, students can also check out the weightage of each unit with all the deleted topics and many more updated information related to the biology syllabus. 

CA Wizard is an online study center where students get complete guidance regarding their careers. It also provides career options after 12.

Download CBSE Class 12 Biology Syllabus 2023-24 PDF

Check CBSE Class 12 Syllabus 2023-24

CBSE Class 12 Biology syllabus has been updated this year. Students must check out the CBSE class 12 biology syllabus 2023-24 given below and also download the class 12 biology syllabus 2023-24 in a PDF format for future reference. 

CBSE Class 12 Biology Marks Distribution 2023-24








Genetics and Evolution



Biology and Human Welfare



Biotechnology and its Applications



Ecology and Environment





Check out the CBSE class 12 Marking Scheme of all subjects

Students can also go through the detailed 12th biology syllabus given below:

Unit-VI Reproduction

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 and oogenesis; menstrual cycle; fertilization, 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-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 human being, birds, and honey bee; linkage and crossing over; sex-linked inheritance – haemophilia, color 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 evidences for biological evolution (paleontology, 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 – Weinberg’s principle; adaptive radiation; 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, ringworm) 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 biocontrol 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 Application

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-X Ecology and Environment

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 (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 Practical Syllabus 2023-24

The CBSE class 12 Biology Practical Syllabus 2024 is given below in detail. Go through the biology practical syllabus for scoring good marks in the exams:

A.  List of Experiments

1. Prepare a temporary mount to observe pollen germination.

2.Study the plant population density by quadrat method.

3.Study the plant population frequency by quadrat method.

4.Prepare a temporary mount of onion root tip to study mitosis.

5.Isolate DNA from available plant material such as spinach, green pea seeds, papaya, etc.

 B.  Study/observation of the following (Spotting)

1. Flowers adapted to pollination by different agencies (wind, insects, birds).

2. Pollen germination on stigma through a permanent slide or scanning electron micrograph.

3. Identification of stages of gamete development, i.e., T.S. of testis and T.S. of ovary through permanent slides (from                grasshopper/mice).

4. Meiosis in onion bud cell or grasshopper testis through permanent slides.

5. T.S. of blastula through permanent slides (Mammalian).

6. Mendelian inheritance using seeds of different colour/sizes of any plant.

7. Prepared pedigree charts of any one of the genetic traits such as rolling of tongue, blood groups, ear lobes, widow’s peak and        colour blindness.

8. Controlled pollination – emasculation, tagging and bagging.

9. Common disease causing organisms like Ascaris, Entamoeba, Plasmodium, any fungus causing ringworm through permanent slides, models or virtual images or specimens. Comment on symptoms of diseases that they cause.

10. Models specimen showing symbolic association in root modules of leguminous plants, Cuscuta on host, lichens.

11. Flash Cards models showing example of homologous and analogous organs.

CBSE Class 12 Biology Practical Evaluation Scheme 2023-24

Evaluation SchemeMarks
One Major Experiment    55
One Minor Experiment   2, 34
Slide Preparation             1, 45
Practical Record + Viva Voce 


Credit to the students’ work over the academic session may be given

Investigatory Project and its


Project and its Record + Viva Voce


CBSE Class 12 Biology Books

Students should refer to the CBSE Class 12 biology books which cover the CBSE class 12 bio syllabus 2024. CBSE class 12 biology prescribed books are as follow:

  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 the CBSE website.

Frequently Asked Questions

Q1. What is the syllabus of Biology Class 12 2023-24?

Ans: CBSE Biology for 2023-24 is as follows:






Genetics and Evolution


Biology and Human Welfare


Biotechnology and its Applications


Ecology and Environment

Q2. How many chapters are there in Class 12 Biology Syllabus 2023-24?

Ans: There are 13 Chapters in Biology Syllabus 2023-24.

Q3. Is NCERT enough for Class 12 Biology?

Ans: Yes, NCERT is the best book for Class 12 Biology.

Q4. Is Class 12 Biology Easy?

Ans: Class 12 Biology is easy as well as Difficult at the same time. But Biology is Scoring Subject.

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