CBSE Class 12 Biology exam held on March 27, 2026 . The CBSE Class 12 Biology question paper solution PDF for all sets (Set 1, Set 2, Set 3) is available setwise with worked solutions and answer keys.
CBSE Class 12 Biology question paper solution PDF — download summary
| Event | Details |
|---|---|
| Exam date | March 27, 2026 |
| Sets available | Set 1, Set 2, Set 3 (setwise PDFs with solutions) |
| Total marks | 100 (theory 70 , practical/internal 30 ) |
| Article update | March 27, 2026 — Bhaskar Das |
The paper covers diversity in living organisms, human physiology, biotechnology, genetics, ecology and reproduction. More than 50 questions are solved in the PDFs — including MCQs, short answers and long-answer solutions.
CBSE Class 12 Biology question paper solution PDF: key answers & highlights
You’ll find worked examples for common exam topics. Notable factual answers published include:
- Meristem culture is the recommended method to obtain a virus‑free sugarcane plant; meristem excision must be done aseptically.
- Chitinase is used in yeast DNA extraction because fungal cell walls contain chitin.
- Transgenic animals carry foreign DNA integrated into all their cells.
- Introduction of Nile Perch led to extinction of over 200 Lake Victoria cichlid species.
- PstI restriction site and cleavage shown with sticky ends example are included.
- Spleen is described as a large erythrocyte reservoir and an important lymphoid organ.
- Benefits of apomictic seeds (genetic stability, no yearly seed purchase) and Gause’s Competitive Exclusion Principle (Paramecium example) are discussed.
A published numeric inconsistency is flagged in one solution: the answer sheet lists option (B) 64 for a DNA bases question but the worked calculation in the PDF yields a different figure. You should verify that specific calculation on your own before taking it as final.
What you should do next
Download the setwise solution PDFs and focus your revision on concepts, labeled diagrams and long‑answer practice. Pay special attention to techniques (CaCl2 + 42°C heat shock for bacterial transformation), hnRNA processing (splicing, 5' capping, 3' polyadenylation) and common ecology and biotechnology examples.
Missing items students asked for
The published materials do not include direct download URLs in the text, a full question‑wise marking scheme, high‑resolution labeled diagrams or video walkthroughs. Time‑management tips and past‑year trend analysis are also not provided.
FAQs
Q: When was the CBSE Class 12 Biology exam held? A: March 27, 2026 .
Q: How many sets of question papers are provided? A: Three sets — Set 1, Set 2, Set 3 .
Q: What is the marks distribution? A: Total 100 marks; theory 70 , practical/internal 30 .
Q: Where can I download solutions? A: Setwise PDF download links are provided alongside the set listings in the published solution page.
Q: Why is chitinase used in yeast DNA extraction? A: Fungal cell walls contain chitin; chitinase breaks the wall to release DNA.
Q: What procedural tip is given for bacterial transformation? A: Chemical competency using CaCl2 followed by brief 42°C heat shock is described.
Q: Which invasive fish caused mass cichlid extinctions in Lake Victoria? A: Nile Perch .
Q: What should you focus on while revising this paper? A: Understand core concepts, practise labelled diagrams and long‑answer questions.