CBSE Class 12 Biology Previous Year Question Papers (2022–2026)

Class 12 Biology board papers with marking schemes

Two sets per year from different CBSE regions. Question papers are published by CBSE; click a PDF to download it free.

Class 12 Biology sample paper 2026-27

CBSE released the 2026-27 Sample Question Paper on 21 September 2026 and confirmed there is no change in the question paper design for 2026-27. Practise it first: it shows exactly how your board paper will look.

Chapter-wise weightage (from 8 board papers)

Average marks each chapter carried per board paper. Start revision with the chapters at the top.

Most repeated Biology questions in CBSE board exams

These questions (or near-identical ones) appeared in more than one board exam year.

1. Observe the contents 1, 2, 3 and 4 of soil samples I, II and III shown in the graph. If the temperature and moisture of all soil samples are identical, which soil sample(s) will show faster decomposition ? 1 (A) Soil Sam…
   Asked in 2024, 2025, 2026Reproductive Health1 mark
2. Which of the following is possible in an aquatic ecosystem? Pyramid of numbers Pyramid of biomass Pyramid of energy a) Inverted Upright Inverted b) Upright Upright Upright c) Inverted Inverted Inverted d) Upright Inverte…
   Asked in 2024, 2025, 2026Ecosystem1 mark
3. /2/1-12 9 P.T.O. 12. The pyramid of biomass in sea is generally inverted because in sea : (A) Biomass of fishes exceeds that of phytoplankton. (B) Number of phytoplanktons is more. (C) Number of phytoplanktons is less. (…
   Asked in 2024, 2026Reproductive Health1 mark
4. The decrease in the T-Lymphocytes count in human blood will finally result in (B) (A) decrease in antigens decrease in antibodies (C) increase in antibodies (D) increase in antigens 57/2/1 9iPage P.T.O. (A)(A) (R) (R) (A…
   Asked in 2025, 2026Human Health & Disease1 mark
5. A woman with normal vision has a colour blind father. She marries a man with normal vision. The percentage chance of their progeny being colour blind is : (A) 25% (B) 50% (C) 75% (D) 100%
   Asked in 2024, 2025Principles of Inheritance1 mark
6. Two statements are given - one labeled Assertion (A) and the other labeled Reason (R). Assertion: Apomictic fruits are seedless. Reason: Apomictic fruits are formed without fertilisation. Which of the following is correc…
   Asked in 2024, 2026Human Reproduction1 mark
7. A population is in genetic equilibrium/Hardy-Weinberg equilibrium for a f the 0·6, then the frequency of genotype Aa is : (A) 0·21 (B) 0·42 (C) 0·48 (D) 0·32
   Asked in 2024, 2026Organisms & Populations1 mark
8. (a) Differentiate between humoral immune response and cell-mediated immune response. (b) Draw a schematic diagram of an antibody molecule and label any four parts.
   Asked in 2024, 2026Human Health & Disease3 marks

See all repeated questions with answers →

Class 12 Biology paper pattern

Based on the sample paper 2026-27 (70 marks).

CBSE additional practice papers for Class 12 Biology

Frequently asked questions