CBSE Class 12 Biology Deleted Syllabus 2025-26 is provided in this article. The 30% reduction in the Biology syllabus is maintained by the board for CBSE Class 12 Exams 2026. Students can download the revised syllabus PDF from the official website cbseacademic.nic.in.
The Central Board of Secondary Education has deleted Class 12 Biology syllabus from the NCERT textbook - Units VI, VIII, and X. Some chapters are completely removed from the syllabus like
- Chapter 1 Reproduction in Organisms
- Chapter 9 Strategies for Enhancement in Food Production
- While, in some chapters, only certain topics have been deleted.
- The syllabus for the practicals has also been reduced.
In total, there are 5 units in CBSE Class 12 Biology Syllabus 2025-26. The theory part has a total weightage of 70 marks and the practical will be held for 30 marks. The exam duration is 3 hours.
CBSE Class 12 Biology Deleted Syllabus 2025-26
The table below contains the complete list of CBSE Class 12 Biology Syllabus 2025-26:
| Units | Chapters | Pages | Deleted Topics |
|---|---|---|---|
| Unit-VI - Reproduction | Chapter 1: Reproduction in Organisms | 3-18 | Whole chapter deleted |
| Unit-VIII - Biology and Human Welfare | Chapter 9: Strategies for Enhancement in Food Production | 165–176, 178 |
Whole chapter deleted |
| Unit-X - Ecology and Environment | Chapter 13: Organisms and Populations | 220 221–222 223–225 225–226 250–252 253–254 254–255 255 |
13.1 Organism and Its Environment
Ques. 1, 2, 3, 9, 10, 11, 12 |
| Chapter 14: Ecosystem | 14.6 Ecological Succession
14.7 Nutrient Cycling
14.8 Ecosystem Services |
||
| Chapter 16: Environmental Issues | 270–286 | Full Chapter |
CBSE Class 12 Biology Practical Deleted Syllabus 2025-26
The reduced syllabus of CBSE Class 12 Biology Practical is tabulated below:
| Part | Particulars | Deleted Practicals |
|---|---|---|
| A | List of Experiments | 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. Study the presence of suspended particulate matter in the air at two widely different sites. 8. Study the effect of different temperatures and three different pH on the activity of salivary amylase on starch. |
| B | Study/observation of the following (Spotting) | 10. Two plants and two animals (models/virtual images) were found in xeric conditions. Comment upon their morphological adaptations. 11. Two plants and two animals (models/virtual images) found in aquatic conditions. Comment upon their morphological adaptations. |
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CBSE Class 12 Biology Marking Scheme
The following tables show the unit-wise marks distribution for CBSE Class 12 Biology theory exam:
| Units | Marks Distribution |
|---|---|
| Reproduction | 16 |
| Genetics and Evolution | 20 |
| Biology and Human Welfare | 12 |
| Biotechnology and its Applications | 12 |
| Ecology | 10 |
| Total | 70 |
CBSE Class 12 Biology Question Paper Pattern
The following tables show CBSE Class 12 Biology question paper pattern with the distribution of marks for each section.
| Section | Question No. | Type of Questions | Marks per Question | Total Marks |
|---|---|---|---|---|
| Section A | 1-16 | MCQs | 1 | 16 |
| Section B | 17-21 | Short Answer Type Questions | 2 | 10 |
| Section C | 22-28 | Short Answer Type Questions | 3 | 21 |
| Section D | 29-30 | Case-based Questions | 4 | 8 |
| Section E | 31-33 | Long Answer Type Questions | 5 | 15 |
| Total Marks | 70 | |||
Also Read
CBSE Class 12 Preparation TipsCBSE Class 12 Biology Previous Years Papers
Check and download CBSE Class 12 Previous Years Papers for Biology from the links provided below:
| Year | Question Paper |
|---|---|
| 2025 | Download Here |
| 2024 | Download Here |
| 2023 | Download Here |
| 2022 | Download Here |
| 2021 | Exams Cancelled |
| 2020 | Download Here |
| 2019 | Download Here |
| 2018 | Download Here |
| 2017 | Download Here |
| 2016 | Download Here |
| 2015 | Download Here |
| 2014 | Download Here |
| 2013 | Download Here |
| 2012 | Download Here |
Frequently Asked Questions
Ques. Which chapters are completely deleted from CBSE Class 12 Biology Syllabus 2025-26?
Ans. The chapters that are completely deleted from CBSE Class 12 Biology are:
- Chapter 1: Reproduction in Organisms
- Chapter 9: Strategies for Enhancement in Food Production
Ques. Is CBSE Class 12 Biology Syllabus 2025-26 reduced?
Ans. CBSE Class 12 Biology Syllabus 2025-26 has been reduced by 30%. The syllabus was earlier reduced during the pandemic, and the reduction is maintained for this year as well.
Ques. How many marks are carried by the unit Ecology and Environment in CBSE Class 12 Biology?
Ans. The unit Ecology and Environment carries a total of 10 marks in CBSE Class 12 Biology.
Ques. What are the topics deleted from Chapter 13 of CBSE Class 12 Biology Syllabus 2025-26?
Ans. The topics deleted from Chapter 13 Organisms and Populations are:
- Organism and Its Environment
- Major Abiotic Factors
- Responses to Abiotic Factors
- Adaptations
Ques. What are the total marks for CBSE Class 12 Biology Syllabus 2025-26?
Ans. The total marks for CBSE Class 12 Biology Syllabus are 100. Out of the total marks, 70 marks will be allotted to the theory exam while 30 marks are carried by the practicals.
Ques. Where can I check CBSE Class 12 Biology Deleted Syllabus 2025-26?
Ans. The revised syllabus for CBSE Class 12 Biology is available for download on the official website cbseacademic.nic.in. Students can also check deleted syllabus in this article.
Ques. Why has CBSE deleted the Class 12 Biology Syllabus?
Ans. The syllabus was mainly reduced in 2021-22 due to the pandemic. In 2021-22, the exams were held in two terms and the syllabus was divided accordingly. However, this reduction has been continued for 2022-23 and 2025-26 as well. The deleted syllabus reduces pressure from students by excluding topics that are already covered in other classes like class 11.
Ques. What are the types of questions asked in CBSE Class 12 Biology Exam?
Ans. CBSE Class 12 Biology exam will include MCQs, short answer type questions, long answer type questions, and case-based questions.
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