CBSE Class 12 Biology Previous Year Question Papers
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CBSE Class 12 Biology previous year papers, 2023 to 2026
The real question papers from the CBSE Class 12 Biology board exams of 2023 to 2026 (8 papers, two sets a year, from different regions, each with a published marking scheme), and the 4 official sample papers for 2023-24, 2024-25, 2025-26, 2026-27. Every question is shown as printed, section by section, with its OR choices.
463 of the 463 questions (counting each OR alternative) have our step-by-step solution, split into the steps that earn marks and checked by an independent re-solve; 12 papers are fully solved. The others say "Solution being checked" until they pass.
Biology: papers by year
For the 2027 board exam
2026 board exam
2025 board exam
2024 board exam
Biology: how often each chapter was asked
Counted from the 8 board papers above (2023 to 2026). A chapter counts as asked in a paper when at least one question, or one of its OR alternatives, is on it. Average marks are over all 8 papers, with an OR pair counted once. Chapter tags are ours.
| Chapter | Asked in | Average marks per paper | Questions | Sample papers |
|---|---|---|---|---|
| Sexual Reproduction in Flowering Plants | 8 of 8 | 9.3 | 31 | 4 of 4 |
| Human Reproduction | 8 of 8 | 8 | 24 | 4 of 4 |
| Reproductive Health | 8 of 8 | 4.1 | 16 | 3 of 4 |
| Principles of Inheritance and Variation | 8 of 8 | 9.1 | 34 | 4 of 4 |
| Molecular Basis of Inheritance | 8 of 8 | 8 | 27 | 4 of 4 |
| Evolution | 8 of 8 | 5.1 | 19 | 4 of 4 |
| Human Health and Disease | 8 of 8 | 9 | 32 | 4 of 4 |
| Microbes in Human Welfare | 8 of 8 | 4.9 | 17 | 3 of 4 |
| Biotechnology: Principles and Processes | 8 of 8 | 7.8 | 34 | 4 of 4 |
| Biotechnology and its Applications | 8 of 8 | 7.6 | 29 | 4 of 4 |
| Organisms and Populations | 7 of 8 | 3.3 | 12 | 4 of 4 |
| Ecosystem | 8 of 8 | 3.1 | 17 | 4 of 4 |
| Biodiversity and Conservation | 8 of 8 | 4.8 | 16 | 4 of 4 |
"Questions" counts each OR alternative in the board papers. Linked chapters list their questions by year on the chapter page.