CBSE Class 12 Biology Syllabus 2020
Updated on Feb 8, 2020 - 12:02 p.m. IST by Saumya.Srivastava
#CBSE Class 12th

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 2020. 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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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








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.

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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 2020 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 2020.

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 33 out of 33 Questions

if Im "general pwd candidate",what is the minimum 12th percentage required to get into Nits?and also is there any separate minimum percentage required to get in individual subject?(i.e. general candidate minimum of 75% in required,so this means 75% in each subject or its total of all subjects)

Manish Singh 29th Feb, 2020

To get into any NITs,IIITs and  CFTIs a general candidate has to get 75% percentage aggregate in his\her class 12 or be in top 20 percentile in the board exams. For SC/ST/PwD candidate, 65% aggregate is required to be eligible to get admission in nits. No individual subjects marks are required.


Is grazing emergence same as critical angle?

Charvi Nayyar 29th Feb, 2020

hello aspirant

When the angle of incidence for a prism is 90 degree then the ray just grazes along the surface of the prism . This is known as grazing incidence and in this case the angle of refraction at the first refracting surface is equal to the critical angle of the material of the prism.

hope this helps


what will happen if I dont give one of my 12 improvement exam?plz reply fast plz?

shivam ranjan 24th Feb, 2020

hello aspirant...

There will not be any problem if you don't give improvement exam after applying for it as it is not mandatory exam. Your old result will remain valid even if you quit improvement exam.



1 View

is physical education included in Mark sheet which will increase the total??

TANUJ JAIN 24th Feb, 2020

Hi James,

As per my knowledge for CBSE Board the students will be graded for their physical education based on tests conducted by the school. However, it will be included in the mark sheet, but will not have an impact on the overall assessment of the student.

Hope this helped,

Thank You.


Will the overall aggregate be calculated out of all 5 subjects or the better 4?

Md Azmer 23rd Feb, 2020

Hello Aspirant,

The aggregated will be calculated with the best 4 subjects. But in some entrance it is all 5 subjects.

Good Luck

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