Class 12

Download Latest CBSE Class 12 Biology Syllabus (Reduced 30%)

The Revised CBSE Class 12 Biology Syllabus 2021 is announced officially on the website. This year, due to the pandemic Covid-19 the CBSE class 12 biology syllabus has been reduced by 30%. For the preparation of the upcoming biology exam 2021, 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.

CBSE Class 12 Biology Marks Distribution 2021

Due to the pandemic covid-19, there is a change in the paper pattern for the CBSE class 12 Biology exam. Therefore, students must go through the marks distribution and prepare well for the upcoming exams.

VIIGenetics and Evolution18
VIIIBiology and Human Welfare14
IXBiotechnology and its Applications12
XEcology and Environment12

Check out the CBSE class 12 Marking Scheme of all subjects

Download CBSE Class 12 Biology Syllabus 2021 PDF

The CBSE class 12 bio syllabus has been revised for this year due to the Covid-19 pandemic. Students must check out the CBSE class 12 biology syllabus 2020-21 given below and also download the Revised CBSE class 12 biology syllabus 2021 in a PDF format for future reference. 

Download New CBSE Class 12 Biology Syllabus 

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. 

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-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: Deleted Topics

The board has removed a few of the topics from the CBSE biology syllabus for class 12 for this academic year. Check out all the deleted topics from the CBSE class 12 bio syllabus given below:

CBSE Class 12 Biology Syllabus Deleted Topics
Chapter-1: Reproduction in Organism

• Reproduction,  a  characteristic feature of all organisms for continuation of species; modes of reproduction – asexual and sexual reproduction; asexual reproduction – binary fission, sporulation, budding, gemmule formation, fragmentation; vegetative propagation in plants.

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.

Chapter 9: Strategies for Enhancement in Food Production

•   Animal husbandry, Plant breeding, tissue culture, single-cell protein.

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 (in brief).

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 impact and mitigation;  ozone layer depletion; deforestation;  exemplifying case study as a success story addressing environmental issue(s).

CBSE Class 12 Biology Practical Syllabus 2021

The CBSE class 12 Biology Practical Syllabus 2021 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. Collect and study soil from at least two different sites and study them for texture, moisture content, pH, and water holding capacity. Correlate with the kinds of plants found in them.

3. Collect water from two different water bodies around you and study them for pH, clarity, and presence of any living organism.

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

5. Study the effect of different temperatures or three different pH on the activity of salivary amylase on starch.

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

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

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

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

6. Common disease causing organisms like Ascaris, Entamoeba, Plasmodium, any fungus

causing ringworm through permanent slides, models, or virtual images. Comment on symptoms of diseases that they cause.

7. Two plants and two animals (models/virtual images) found in xeric conditions. Comment upon their morphological adaptations.

8. Two plants and two animals (models/virtual images) found in aquatic conditions. Comment upon their morphological adaptations.

CBSE Class 12 Biology Practical Evaluation Scheme 2021

Evaluation SchemeMarks
One Major Experiment    5, 65
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 Practical Syllabus: Deleted Topics

The Deleted topics from the CBSE class 12 practical syllabus are given below:

CBSE Class 12 Biology Practical Syllabus Deleted Topics
A: List of Experiments

1.   Study the presence of suspended particulate matter in the air at two widely different sites.

2.   Study the plant population density by quadrat method.

3.   Study the plant population frequency by quadrat method.

B. Study/Observer of the following (spotting)

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

2.   Mendelian inheritance using seeds of different colours/sizes of any plant.

3.   Controlled pollination – emasculation, tagging, and bagging.

CBSE Class 12 Biology Books

Students should refer to the CBSE Class 12 biology books which cover the CBSE class 12 bio syllabus 2021. 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 revised CBSE class 12 biology syllabus?

Ans: The revised CBSE class 12 biology syllabus is available on this page. 

Q2. What all chapters are removed from the CBSE class 12 biology syllabus for the upcoming exam 2021?

Ans: The removed topics from the CBSE class 12 biology syllabus and for biology practical both are mentioned above on this page.

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