CBSE Class 12 Biology Important Questions
CBSE Class 12 Biology important questions for the 2027 board exam: unit-wise marks for 2026-27, chapter-wise practice, preparation strategy and exam tips.
CBSE Class 12 Biology for the 2027 board exam: which units carry the most marks, where to find chapter-wise important questions, and how to practise them.
Chapter-wise important questions with answers are on our CBSE Class 12 Biology important questions page.
Unit-Wise Marks (2026-27)
| Unit | Marks |
|---|---|
| Reproduction | 16 |
| Genetics and Evolution | 20 |
| Biology and Human Welfare | 12 |
| Biotechnology and its Applications | 12 |
| Ecology and Environment | 10 |
| Total (theory) | 70 |
Environmental Issues is assessed only by your school in 2026-27.
Source: CBSE Class 12 Biology syllabus 2026-27 (cbseacademic.nic.in).
How to Practise Important Questions
- Start with the biggest units — they carry the most marks.
- Solve without looking at solutions first — this builds real exam confidence.
- Time yourself — practise under exam conditions.
- Mark questions you get wrong — revise these again 2–3 days before the exam.
Practise Biology chapter-wise
Super Tutor has chapter-wise Biology practice quizzes with answers for CBSE Class 12.
Try it freePreparation Strategy for CBSE Biology
- Learn diagrams and label them neatly.
- Use exact textbook terms in definitions.
- Make flowcharts for processes and cycles.
- Practise case-based and application questions.
Exam Tips for CBSE Class 12 Biology
- Read every question twice before starting — misreading costs marks.
- Attempt all questions — there is no negative marking in board exams.
- Show all steps — the marking scheme gives marks for steps, not just the final answer.
- Draw neat, labelled diagrams where the question asks for them.
- Keep 15 minutes for revision — check for silly mistakes and unanswered questions.
Unit-wise marks from the CBSE Class 12 Biology syllabus 2026-27 (cbseacademic.nic.in).
Turn this into exam marks
Super Tutor gives you chapter summaries, revision notes, practice quizzes and an AI doubt solver matched to your board syllabus — so you revise smarter, not longer.
Start freeFrequently Asked Questions
Which chapters carry the most marks in CBSE Class 12 Biology?
In the CBSE Class 12 Biology syllabus 2026-27, the biggest units are Genetics and Evolution (20 marks), Reproduction (16 marks), Biology and Human Welfare (12 marks). The full unit-wise split is in the table on this page.
Is NCERT enough for CBSE Class 12 Biology?
NCERT textbooks are the prescribed books for CBSE, and board questions are built on them. Finish every NCERT example and exercise first, then practise sample papers and previous year papers.
How many days are enough to prepare for CBSE Class 12 Biology?
With focused preparation, 30–45 days if you have already studied the syllabus once. Give Biology 2–3 hours a day, and in the last week focus only on revision and past papers. Starting earlier is always better.
What are the most repeated questions in CBSE Biology?
Certain question types come up regularly — diagrams, definitions, process explanations and case-based questions. Solving the last few years' papers and the latest sample or specimen paper shows you these patterns.