CBSE Class 12 Biology Chapter-Wise Weightage 2025: Unit-wise marks distribution
The chapter-wise CBSE Class 12 Biology Weightage 2025 is given here along with the blueprint of the paper. The marks distribution for units is official and for chapters, it is unofficial as per past papers' analysis.
CBSE Class 12 Biology Weightage 2025: The Central Board of Secondary Education (CBSE) has released CBSE Class 12 chapter-wise weightage 2024. Candidates can check out the chapter-wise and unit-wise weightage below. Furthermore, the marks weightage for the practical segment has been provided. For biology, the theory segment will be of 70 marks and the practical segment will be of 30 marks. In the theory section, questions will appear from 5 units, and in the practical section, 6 schemes will be evaluated. For the visually impaired, the evaluation schemes are 4. Candidates can check out the complete CBSE Class 12 Biology chapter-wise weightage 2025 on the page below for more clarity.
CBSE Class 12 Biology Weightage 2025
The following table displays CBSE Class 12 Biology weightage, along with unit-wise weightage for the theoretical segment:
| Units | Unit Name | Chapter Name | Marks |
| VI | Reproduction | Sexual Reproduction in Flowering Plants | 16 marks |
| Human Reproduction | |||
| Reproductive Health | |||
| VII | Genetics and Evolution | Principles of Inheritance and Variation | 20 marks |
| Molecular Basis of Inheritance | |||
| Evolution | |||
| VIII | Biology and Human Welfare | Human Health and Diseases | 12 marks |
| Microbes in Human Welfare | |||
| IX | Biotechnology and its Applications | Biotechnology - Principles and Processes | 12 marks |
| Biotechnology and its Applications | |||
| X | Ecology and Environment | Organisms and Populations | 10 marks |
| Ecosystem | |||
| Biodiversity and its Conservation | |||
| Total | 70 marks | ||
CBSE Class 12 Biology Practical Weightage 2025
The table below shows CBSE Class 12 Biology weightage 2025 for the practical segment:
| Evaluation Scheme | Marks |
| One Major Experiment | 5 |
| One Minor Experiment | 4 |
| Slide Preparation | 5 |
| Spotting | 7 |
| Practical Record + Viva Voce | 4 |
| Investigatory Project and its Project Record + Viva Voce | 5 |
| Total | 30 |
CBSE Class 12 Biology Practical Weightage 2025 for Visually Impaired
The CBSE Class 12 Biology weightage 2025 for the practical segment for visually impaired students is as follows:
| Evaluation Scheme | Marks |
| Identification/Familiarity with the apparatus | 5 |
| Written test (Based on given/prescribed practicals) | 10 |
| Practical Records | 5 |
| Viva | 10 |
| Total | 30 |
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