CBSE Class 12 Biology Marks Distribution 2025-26 Chapter-wise
The chapter-wise CBSE Class 12 Biology Weightage 2025-26 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 Marks Distribution 2025-26 : For Biology, candidates can find CBSE Class 12 Marks Distribution 2025-26 on the page below. The marks distribution has been provided for all units and their respective chapters. Furthermore, the marks' weightage has also been stated for all evaluation schemes for the Practical segment. The maximum number of questions will come from the Genetics and Evolution unit, and Reproductive Health chapter, Principles of Inheritance and Variation, the Molecular Basis of Inheritance, and Human Health and Disease. Therefore, candidates must primarily focus on these chapters while preparing for the examination, and after completing these, they must prepare the remaining ones.
CBSE Class 12 Biology Marks Distribution 2025-26
Find out the unit and chapter-wise CBSE Class 12 Biology Weightage 2025-26 here in the given table:
Unit Number | Unit Name | Chapter Name | Marks |
VI | Reproduction | Sexual Reproduction in Flowering Plants | 7 |
Human Reproduction | 6 | ||
Reproductive Health | 13 | ||
Total | 16 | ||
VII | Genetics and Evolution | Principles of Inheritance and Variation | 8 |
Molecular Basis of Inheritance | 8 | ||
Evolution | 4 | ||
Total | 20 | ||
VIII | Biology and Human Welfare | Human Health and Diseases | 9 |
Microbes in Human Welfare | 3 | ||
Total | 12 | ||
IX | Biotechnology and Its Applications | Biotechnology - Principles and Processes | 6 |
Biotechnology and its Applications | 6 | ||
Total | 12 | ||
X | Ecology and Environment | Organisms and Populations | 5 |
Ecosystem | 3 | ||
Biodiversity and its Conservation | 2 | ||
Total | 10 | ||
Theory Total | 70 marks | ||
CBSE Class 12 Biology Marks Distribution 2025-26: Practical
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The following table highlights the CBSE Class 12 Biology Marks Distribution 2025-26 for 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 Weightage 2025-26 for Other Subjects |
| Name of the Subject | Weightage Link |
| Accountancy | CBSE Class 12 Accountancy Marks Distribution 2025-26 Chapter-wise |
CBSE Weightage for Class 10 |
| Name of the Subject | Weightage Link |
| English | CBSE Class 10 English Marks Distribution Chapter-Wise 2025-26 |
| Mathematics | CBSE Class 10 Mathematics Marks Distribution 2025-26 Chapter-Wise |
| Science | CBSE Class 10 Science Marks Distribution Chapter-Wise 2025-26 |
| SST (Social) | CBSE Class 10 SST Marks Distribution 2025-26 Chapter-Wise |
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