CBSE Class 12 Biology Question Bank 2026-27
Overview
A comprehensive, exam-focused question bank covering the complete CBSE Class 12 Biology syllabus for 2026–27. It spans all 16 chapters across every unit, with 880+ original questions mapped to the board exam pattern and weighted by marks. Total syllabus coverage: 139 marks.
What's Inside
880+ questions across 7 question types, every chapter has 55 questions:
Type | Per Chapter | Total | Marks |
MCQs | 20 | 320 | 1 mark each |
Assertion-Reason | 5 | 80 | 1 mark each |
Very Short Answer | 12 | 192 | 2 marks each |
Short Answer | 8 | 128 | 3 marks each |
Long Answer (with OR) | 2 | 32 | 5 marks each |
Case-Based | 3 | 48 | 4 marks each |
HOTS | 5 | 80 | 4 marks each |
Every chapter also includes 16 Complete Answer Keys with explanations.
Chapter Coverage
Ch. | Topic | Board Marks |
1 | Reproduction in Organisms | 5 |
2 | Sexual Reproduction in Flowering Plants | 9 |
3 | Human Reproduction | 6 |
4 | Reproductive Health | 4 |
5 | Principles of Inheritance and Variation | 15 |
6 | Molecular Basis of Inheritance | 14 |
7 | Evolution | 10 |
8 | Human Health and Disease | 8 |
9 | Strategies for Enhancement in Food Production | — |
10 | Microbes in Human Welfare | — |
11 | Biotechnology: Principles and Processes | 12 |
12 | Biotechnology and Its Applications | — |
13 | Organisms and Populations | — |
14 | Ecosystem | — |
15 | Biodiversity and Conservation | — |
16 | Environmental Issues | — |
Key Features
1. Chapter Opener with Key Concepts Each chapter begins with a concise Key Concepts box — a bullet-point summary of all essential topics — so students build a mental framework before attempting questions.
2. Exam Tips (Every Chapter) A dedicated Exam Tip box at the start of each chapter highlights the most frequently tested topics, common MCQ traps, and mistakes to avoid in board exams. For example: "Double fertilisation is a CBSE favourite question" or "Hardy–Weinberg calculations are a mathematical favourite — practise allele frequency problems."
3. ★ Extra Board Tips (Cross-chapter) Strategically placed Extra Board Tips throughout the document highlight high-priority exam points across chapters — from drawing the lac operon to memorising IUCN Red List categories to knowing Bt toxin mechanism.
4. Chapter Statistics Box Each chapter shows Board Marks, Total Questions (55), and a Recommended Time (e.g., 90 minutes), training students in real exam time management.
5. Diagram-Based MCQs Every chapter's Section A includes a dedicated 📊 Diagram-Based Question with a 💡 Diagram Tip explaining the key visual concept — e.g., Punnett squares, spermatogenesis stages, DNA replication, Hardy–Weinberg bar graphs, flower anatomy. This directly addresses a common source of marks in CBSE exams.
6. Real-Life Case-Based Questions Three case-based questions per chapter present real-world scenarios — Dal Lake eutrophication, Antarctic ozone hole, Gause's Paramecium experiment, cheetah genetic bottleneck, forensic DNA profiling, sugar mill river pollution — mirroring the style of CBSE Section E questions.
7. HOTS (Higher Order Thinking Skills) Five HOTS questions per chapter go beyond rote recall, requiring students to apply, analyse, and evaluate. Examples: "If meiosis were replaced by mitosis, what would happen to chromosome number and species survival?" or "A plant reproduces only by vegetative propagation for centuries — discuss the genetic risks."
8. Long Answers with OR Choices Two 5-mark Long Answer questions per chapter, each with an OR alternative, exactly replicating the CBSE Section D format.
9. Complete Answer Keys Every chapter ends with a full answer key covering all 7 question types — MCQ answers with explanations, A/R answers, and detailed model answers for VSA, SA, LA, and Case-Based questions.
10. Board Exam Strategy Page A dedicated strategy guide with 6 numbered steps: how to use key concepts, exam tips, section-wise practice sequence, answer key review, HOTS approach, and timed practice guidance. Includes a board exam reminder: "Chapters 5 and 6 carry 29 marks combined — revise most thoroughly."
Ideal For
CBSE Class 12 students preparing for board exams (2026–27)
Teachers looking for chapter-wise, section-mapped question sets
Coaching institutes needing ready-to-use test material aligned to the latest CBSE pattern
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Reviews
80 assertion-reason questions across all chapters is excellent preparation. These questions are tricky in boards and having dedicated practice made a real difference.
Every chapter has a dedicated diagram-based MCQ with a Diagram Tip. Punnett squares, spermatogenesis stages, DNA replication all covered this way. Very helpful.
Lac operon, DNA replication, transcription and translation all covered through diagrams, MCQs, and HOTS questions. The most thorough treatment I have found.
Immunity, diseases, drugs and alcohol all covered across MCQs, case-based and HOTS questions. One of my weaker chapters and it became very strong after this.
GMOs, Bt crops, gene therapy and ethical concerns all covered through a range of question types. This chapter often gets surface-level treatment elsewhere.
Covering every chapter with 55 questions each is genuinely impressive. MCQs, assertion-reason, case-based, HOTS and long answers all in one place. Nothing left out.
Population interactions, growth models and ecological adaptations are covered through questions that push you to think analytically rather than just recall.
Two 5-mark long answers per chapter each with an OR alternative is exactly how CBSE Section D works. Practicing in this format built real exam familiarity.
Questions like what would happen if meiosis were replaced by mitosis are exactly the kind of application questions that board exams are increasingly including.
Chapters 5 through 7 covering genetics and evolution are the most important unit for boards. The coverage here across all 7 question types is exceptional.