CBSE Class 12 Biology Syllabus 2020

CBSE Class 12 Biology Syllabus 2020 - Central Board of Secondary Education has released the CBSE 12th Biology syllabus on the official website. Students must refer to the CBSE Class 12 Biology syllabus 2020 to know the important topics and marking scheme per subject. The CBSE Class 12th exams are scheduled to be conducted from February 15 to April 6, 2020, tentatively. CBSE practical exams will be conducted from January 1 to February 7, 2020. Therefore, students must buck up and start preparing for the CBSE Class 12th exams. The total marks for the theory and practical exams will be 70 and 30 respectively. Referring to the CBSE Class 12 Biology syllabus 2020 will let the students plan their studies accordingly. Read this article to know the CBSE Class 12 Biology Syllabus 2020 and know the exam pattern and preparation tips.

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Latest: CBSE Class 12 syllabus has been released. Download pdf here.

CBSE Class 12 Biology Syllabus 2020 - Exam Pattern

Students must go through the exam pattern of CBSE 12th Biology. This will let them know the marking scheme and help then plan their studies accordingly.

Exam Pattern of CBSE Class 12 Biology

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Genetics and Evolution



Biology and Human Welfare



Biotechnology and its Applications



Ecology and Environment




CBSE Class 12 Biology Syllabus 2020

Students can go through the CBSE Class 12 Biology syllabus from the table provided below. They must prepare for the exam after referring to the important topics and marking scheme. Biology should not be ignored as this is the subject which will let you score very high if prepared with the right strategy. Go through the CBSE Class 12 Biology syllabus 2020 below.

CBSE 12th Biology Syllabus 2020



Important Topics

Unit VI - Reproduction

Chapter 1 - Reproduction in organisms

Reproduction, Modes of reproduction - asexual and sexual reproduction, vegetative propagation in plants, etc.

Chapter 2 - Sexual Reproduction in Flowering Plants

Post-Fertilization events - development of endosperm and embryo, outbreeding devices, double fertilization; post-fertilization events -

development of endosperm and embryo, etc.

Chapter 3 - Human Reproduction

Menstrual cycle; fertilisation, microscopic anatomy of testis and ovary, parturition (elementary

idea); lactation (elementary idea), etc.

Chapter 4 - Reproductive Health

IVF, ZIFT, GIFT, amniocentesis, contraception and medical termination of pregnancy, etc.

Unit VII - Genetics and Evolution

Chapter 5 - Principles of Inheritance And Variation

Multiple alleles and inheritance of blood groups, Sex determination - in

humans, birds and honey bee, haemophilia, colour

Blindness, etc.

Chapter 6 - Molecular Basis of Inheritance

Genetic code, Translation, gene expression and regulation, Structure of DNA and RNA, etc.

Chapter 7 - Evolution

Mechanism of evolution - the variation, comparative anatomy, Gene flow and genetic drift, human evolution, etc.

Unit - VIII

Chapter 8- Human Health and Disease

Pneumonia, the common cold, Basic concepts of immunology - vaccines; cancer, drug and alcohol abuse, etc.

Chapter 9 - Strategies for Enhancement in Food Production

Tissue culture, single-cell protein, Plant breeding, Apiculture and Animal husbandry, etc

Chapter 10 - Microbes in Human Welfare

Antibiotics; production, sewage treatment, energy generation, etc.

Unit IX - Biotechnology and Its Applications

Chapter 11 - Biotechnology: Principles and Processes

Genetic Engineering (Recombinant DNA Technology).

Chapter 12 - Biotechnology and its Applications

Gene therapy; genetically modified organisms, transgenic animals; biosafety issues, etc.

Unit X - Ecology and Environment

Chapter 13 - Organisms And Population

Mutualism, competition, predation, birth rate and death rate, age distribution, etc.

Chapter 14 - Ecosystem

Seed dispersal, oxygen release, energy flow; pyramids of number, energy; nutrient cycles

Chapter 15 - Biodiversity and Conservation

Red Data Book, biosphere reserves, patterns, importance; loss of biodiversity, etc.

Chapter 16 - Environmental Issues

Greenhouse effect and climate change impact, ozone layer depletion; deforestation, Air pollution and its control, etc.

CBSE Class 12 Biology Syllabus 2020 - Practicals

Students must go through the practical exam pattern of CBSE 12th Biology. Along with the CBSE Class 12 Biology syllabus 2020, they must refer to the practical syllabus and marking scheme which is provided below.

CBSE 12th Practical Exam Pattern 2020

Evaluation Scheme

Marking Scheme

One Major Experiment

5 Marks

One Minor Experiment

4 Marks

Slide Preparation

5 Marks


7 Marks

Practical Record+Viva Voce

4 Marks

Project Record + Viva Voce

5 Marks



CBSE Class 12 Biology Syllabus 2020 - Question Paper Design

In addition to CBSE Class 12 Biology syllabus 2020, students can go through the question paper design in the table provided below. This will let them have a glimpse of the number of questions asked, weightage, etc.

CBSE 12th Biology Question Paper Design

Typology of Questions

Very Short Answer (VSA)

(1 mark)

Short Answer-I (SA-I)

(2 marks)

Short Answer-II (SA-II)

(3 marks)

Long Answer (LA)

(5 marks)

Total Marks



1) Remembering- (Knowledge-based simple recall questions,

to know specific facts, terms, concepts, principles, or theories, Identify, define,

or recite, information)







2) Understanding- (Comprehension -To be familiar with the meaning and to understand conceptually, interpret, compare, contrast, explain, paraphrase








3) Application(Use abstract information in a concrete situation, to apply knowledge to new situations, Use given content to interpret a situation, provide an example,

or solve a problem)







4) High Order Thinking Skills (Analysis & Synthesis-Classify, Compare, Contrast, or differentiate between different pieces of information, Organize and/or integrate unique

pieces of information from a variety of sources)







5)Evaluation-(Appraise, judge, and/or justify the value or worth of a decision or outcome, or to predict outcomes based on values)














Also, read Courses after 12th

CBSE Class 12 Biology Preparation Tips 2020

Students must have started preparing for the CBSE Class 12th as the exams are near. Therefore they must implement some simple but effective tips and tricks to score well in the same. Coming to Biology, it is a subject which will help you score very well in case you take it seriously and give your best. Go through some of the best preparation tips for CBSE 12th Biology.

  • Complete the CBSE Class 12 Biology syllabus 2020 as soon as possible so that you can give maximum time for revision.

  • Students must refer to the CBSE Class 12 time table and plan their studies accordingly.

  • Do not mug up the theories of Biology, instead try to understand the meaning of the same and make personal notes. These notes will help you to revise at last moment.

  • After completing the CBSE Class 12 Biology syllabus 2020, students must solve the CBSE Class 12 question papers. This will help them to know the exam pattern, marking scheme and important topics.

  • Dedicate maximum time for the revision and do not ignore any doubts. Clear them right away. Seek help from others in case of confusion. Also, do not stress about the board instead give your best and score well in CBSE Class 12 result.

Frequently Asked Question (FAQs) - CBSE Class 12 Biology Syllabus 2020

Question: What is the passing marks in CBSE Class 12th exams?


Students must score at least 33 per cent marks per subject in order to pass the CBSE Class 12 exams.

Question: When will the CBSE Class 12 result 2020 be declared?


Central Board of Secondary Education will declare the CBSE 12th result 2020 in the first week of May 2020.

Question: Will the exam centre for the CBSE Class 12 practical exams be different in the year 2020?


NO, as per the recent notification, CBSE Class 12 practical exams will be held in the respective schools of the students.

More like CBSE Class 12th

Questions related to CBSE Class 12th

Showing 16 out of 16 Questions

How students having Biology as an additional subject should fill the Neet form? I have passed class 12th in 2018 from cbse in subject group PCM and had given exam for Bio. as an additional subject from nios in 2019 . So my ques. is what should i write in class 12th roll no. section in neet form ?

Yash Dev Student Expert 12th Dec, 2019

Hello student in this case guess you should give your class 12 Roll number of nios in which you passed biology subjects. Neet eligibility says Candidates need to pass class 12 with physics chemistry and biology. So at the time of admission you might face difficulties if you provide them cbse roll no in which there's no biology.

Feel free to comment if you have any doubt

Good luck


What should I do if I fail in class 11th?

_Abhishek_Vatsya Student Expert 7th Dec, 2019


11th results doesn't matter soo much.If you have interest in that stream then you can ignore 11th results overall stream matters.Do focus in main papers like in PCM/PCB in Science stream.Aslo,you might have interest in other stream then you can can change stream as it is perfect time for that.Don't think about 2nd option Soo much if you chosen stream  as per your interest..

Ask if any query.


Sir, I failed in MATHS in Class 12 board exams 2019. Now, Ive registered myself as a failure candidate to reappear in all subjects in 2020. So my question is, will i have to give practicals and submit projects of all subjects like previous year?

Piyeta Ghosh 2nd Dec, 2019

Hello aspirant

Now that you have registered yourself to appear for all the subjects , which means you are repeating 12th standard again. The board views you as a normal 12th grade student.

Hence, you have to appear for all the exams (internals and externals), practicals, assignments etc.

Hence, the answer is YES.



If a medical student with 70% in cbse class 12th board can be able to apply BITSAT form 2020?

Malini S N 2nd Dec, 2019


Candidates must have passed their class 12 with Physics, Chemistry and Mathematics as compulsory subjects and candidate who have opted for biology must have 75% aggregate score in Physics, Chemistry and Mathematics.So,if you have physics,chemistry and maths as compulsory subjects,then you will be eligible.Candidates must also score 60% individually in Physics, Chemistry and Mathematics.

All the best!!


last year I will give practical exam of all subjects and pass in all subjects but fail in theory so this time I also give practical exam ?

Devraj choudhary Student Expert 23rd Nov, 2019


Yes, you need to appear for each and every exam this time irrespective of whether you passed last year or not. Your new result will consist of new grades or marks replacing the older ones.

In supplemenry exam you need not to give all exam but just in which you failed.

Hope it helps

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