CBSE Class 12 Biology Weightage 2026 Unit and Chapter-Wise Marks Distribution
CBSE Class 12 Biology Weightage for all chapters is mentioned here. Check the marks distribution in detail and prepare the chapters accordingly. More focus can be given on chapters with high marks. Continue reading the article for more information.
CBSE Class 12 Biology Weightage 2026 : The subject is divided into a theory exam and a practical exam of 70 marks and 30 marks, respectively. In the theory exam, Genetics and Evolution carry the highest marks. The students will find questions worth 20 marks from this chapter. Besides this, students can check the marking scheme for each of the chapters from the table provided below in the article. When preparing the CBSE Class 12 Biology Syllabus 2025-26 , students can check the marks for each of the chapters. According to the marks, they can prepare the topics and questions. For more details about the CBSE Class 12 Biology chapter-wise weightage, you can continue reading the article.
Class 12 Biology Weightage 2026 Theory Exam - Chapter Wise
From the following table, check out the names of the units, the chapters included in each unit and the weightage given to each chapter.
Unit | Chapter | Weightage |
Unit VI: Reproduction | Sexual Reproduction in Flowering Plants | 7 marks |
Human Reproduction | 6 marks | |
Reproductive Health | 3 marks | |
Total | 16 marks | |
Unit VII: Genetics and Evolution | Principles of Inheritance and Variation | 8 marks |
Molecular Basis of Inheritance | 8 marks | |
Evolution | 4 marks | |
Total | 20 marks | |
Unit VIII: Biology and Human Welfare | Human Health and Diseases | 9 marks |
Microbes in Human Welfare | 3 marks | |
Total | 12 marks | |
Unit IX: Biotechnology and Its Applications | Biotechnology - Principles and Processes | 6 marks |
Biotechnology and Its Applications | 6 marks | |
Total | 12 marks | |
Unit X: Ecology and Environment | Organisms and Populations | 5 marks |
Ecosystem | 3 marks | |
Biodiversity and Its Conservation | 2 marks | |
Total | 10 marks |
Also Check CBSE Class 12 Biology Important Questions 2026
CBSE Class 12 Biology Weightage 2026 Practical Exam
The practical exam will be of 30 marks. Check out the following details and aim at performing your best.
Evaluation Scheme for Examination | Marks |
One Major Experiment | 5 Marks |
One Minor Experiment | 4 Marks |
Slide Preparation | 5 Marks |
Spotting | 7 Marks |
Practical record + viva voce | 4 Marks |
Investigatory project and its project record + viva voce | 5 Marks |
CBSE Class 12 Biology Question Paper Blueprint 2026
When preparing for the board exams, students should go through the blueprint. It gives an idea of the types of questions asked in the exam and marks allotted to each of the sections in the question paper.
- The Biology Question paper is divided into five parts: A, B, C, D, and E.
- Section A includes 16 multiple-choice questions of 1 mark each.
- Section B consists of 5 short questions for 2 marks each.
- Section C contains 7 short questions of 3 marks each.
- Section D consists of 2 case-based questions of 4 marks each.
- Section E consists of 3 long questions of 5 marks each.
S. No. | Competencies | Weightage (%) |
| 1. | Demonstrate Knowledge and Understanding | 50 |
2 | Application of Knowledge/Concepts | 20% |
3 | Analyse, Evaluate and Create | 30% |
| - | Total | 100% |
For better performance in exams, students can regularly solve the CBSE 12th Biology Sample Paper 2025-26 and practice a variety of questions. Regularly visit the page for the latest information about the CBSE Class 12 Biology Weightage 2026.
Students can also check the weightage of other subjects from the links added below:
| CBSE Class 12 Chemistry Weightage 2026 | CBSE Class 12 Physics Weightage 2026 |
| CBSE Class 12 Math Weightage 2026 | CBSE Class 12 English Weightage 2026 |