CBSE ( (Central Board of Secondary Education) has recently announced the Class 12th Biology syllabus on its official website. Students can download the updated syllabus for this session on its official website. Students must download and have a look at the updated syllabus before starting their preparation for the new session.
In this article we have provided revised CBSE Class 12th Biology syllabus along with the updates provided by the CBSE. Students can click on the direct link available below to get direct access to the syllabus.
CBSE Class 12 Biology Syllabus- Direct Link
| Class 12th Biology Direct Link Available |
CBSE Class 12 Biology Subject Pattern
| THEORY | ||
| Units | Unit Title | Marks |
| 1 | Reproduction | 16 |
| 2 | Genetics and Evolution | 20 |
| 3 | Biology and Human Welfare | 12 |
| 4 | Biotechnology and its Applications | 12 |
| 5 | Ecology and Environment | 10 |
| Total Marks | 70 | |
| PRACTICAL ASSESSMENT | ||
| Total Marks | 30 | |
CBSE Class 12 Biology Syllabus Overview
| Units | Chapters |
| Unit 1- Reproduction |
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| Unit 2- Genetics and Evolution |
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| Unit 3- Biology and Human Welfare |
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| Unit 4- Biotechnology and its Applications |
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| Unit 5- Ecology and Environment |
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How To Download CBSE Class 12 Biology Syllabus 2025?
Here are the steps to download the CBSE Class 12th Biology syllabus:
- Visit the official website i.e cbseacademic.nic.
- Find the “Curriculum” tab and click “Curriculum 2024-25”.
- You will be redirected to a new page. Find ‘ Senior Secondary Curriculum (XI-XII)” and click on it.
- Click on “Academic Electives- Group A” and click on it.
- Choose the subject “Biology”’ and download it for future reference.
CBSE Class 12 Practical Assessment Scheme
The maximum marks in Class 12th Biology is 100 marks. Out of 100 marks, the theoretical exam has 70 marks. Remaining 30 marks are for practicals.
Here is the analysis for Biology practical assessment:
| One Major Experiment 5 Spotting 7 | 5 |
| One Minor Experiment 2 & 3 | 4 |
| Slide Preparation 1 & 4 | 5 |
| Spotting | 7 |
| Practical Record + Viva Voce | 4 |
| Investigatory Project and its Project Record + Viva Voce | 5 |
| Total | 30 |
CBSE Class 12 Biology Practical Syllabus
Out of 100 maximum marks, 30 marks compromises of practical assessment. Practical assessment consists of two major parts;
- Viva round consists of maintaining a practical book and writing the assessment.
- Conducting Experiments in the biology lab.
Here are the experiment topics to cover:
- Study of flowers adapted to pollination by different agencies (wind, insects).
- Identification of T.S of morula or blastula of frog (Model).
- Study of Mendelian inheritance pattern using beads/seeds of different sizes/texture.
- Preparation of pedigree charts of genetic traits such as rolling of tongue, color blindness.
- Studyof emasculation, tagging and bagging by trying out an exercise on controlled pollination.
- Identify common disease causing organisms like Ascaris (model) and learn some common symptoms of the disease that they cause
- Comment upon the morphological adaptations of plants found in xerophytic conditions
Also See:
CBSE Class 12 Syllabus 2025: Download CBSE Syllabus Class 12 PDF for All Subjects
CBSE Class 12 Chemistry Syllabus 2025 – Download PDF
CBSE Class 12 Physics Syllabus- Download PDF For 2025
CBSE Class 12 Biology Syllabus FAQs
1. What are the units in Class 12th Biology syllabus?
Answer: Class 12th Biology syllabus consists of 5 units comprising 14 chapters. These units are:
Reproduction
Genetics and Evolution
Biology and Human Welfare
Biotechnology and its Applications
Ecology and Environment
2. How can I download the CBSE Class 12th Biology syllabus?
Answer: Follow the below mentioned steps to download the CBSE Class 12th Biology syllabus:
Visit the CBSE Academic website.
Click on “Curriculum” from the tab and you will be taken to the curriculum page.
Click on “Senior Secondary Curriculum (XI-XII) and click on it.
Find “ Academic Electives- Group A” and click on it.
Find your concerned subject to download.
3. Which are the most important units in CBSE Class 12th Biology syllabus?
Answer: The most important units in CBSE Class 12th Biology syllabus are Reproduction, Genetics and Evolution, Biology and Human Welfare, Biotechnology and its Applications and Ecology and Environment .
4. What are the chapters in the first unit of Class 12th Biology syllabus?
Answer: Unit 1 of CBSE Class 1th Biology syllabus is Reproduction. The most important chapters in this unit are:
Sexual Reproduction in Flowering Plants
Human Reproduction
Reproductive Health
5. What is the marking scheme of Class 12th Biology?
Answer: Class 12th Biology exam is conducted in two parts i.e Theory and Practical. The maximum marks of these two parts is 100. The theoretical (written exam) weighs 70 marks out of total and practical weighs around 30 marks.
