The Class 12 Biology NCERT Exemplar Book PDF (2026-27 edition) is the official NCERT Exemplar Problems publication for Class 12 Biology - a separate book from the main NCERT textbook, with harder MCQs, very short answer questions, short answer questions, and long answer problems that go beyond the regular back-exercise. Used widely by NEET / AIIMS / CUET aspirants for the kind of conceptual depth the back-exercise alone does not test.
- Chapters covered: 13 chapters, mirroring the main NCERT chapter numbering
- Format: chapter-wise PDFs from the official NCERT Exemplar Problems publication
- Question types: MCQ (single correct), MCQ-II (multi-correct), VSA, SA, LA - the standard Exemplar question taxonomy
- Exam alignment: CBSE Class 12 Biology theory paper (70 marks), NEET, AIIMS, CUET-UG Biology
The Class 12 Biology NCERT Exemplar Book PDFs hosted here are the official NCERT publication, downloaded from ncert.nic.in and indexed for easy chapter-wise navigation.
Class 12 Biology Exemplar Book PDF: All Chapters
Every chapter of the 2026-27 Class 12 Biology NCERT Exemplar, downloadable as a free PDF. The list runs in NCERT chapter order.
Why Download the Class 12 Biology NCERT Exemplar Book PDF?
The Exemplar is the bridge between the NCERT back-exercise and the NEET / AIIMS / CUET question paper. The problems are harder, the question types are more varied, and the conceptual depth matches what competitive exams actually test.
- Beyond the back-exercise: the Exemplar problems sit at a higher difficulty level than the regular NCERT back-exercise; they are the next step once the regular back-exercise feels easy.
- Five question types per chapter: MCQ (single correct), MCQ-II (multi-correct), VSA (1-2 mark), SA (3 mark), LA (5 mark) - the same taxonomy CBSE uses on the board paper plus the MCQ-II type JEE uses.
- Used by NEET / AIIMS / CUET coaching institutes: the Exemplar problems are routine reference material in most coaching-institute Class 12 modules.
- Chapter-wise download: download only the chapters you need - useful when your weekly test focuses on a specific chapter.
- Free and official: the same NCERT Exemplar Problems publication you would buy in print, downloadable as a free PDF.
- Pairs with the worked Exemplar Solutions: open the Exemplar Solutions alongside this PDF when you want to check your answer or see a recommended working pattern.
What 15,290 students told us about their Class 12 Biology Exemplar usage
Source: Magnet Brains on YouTube
Class 12 Biology Topic Map (Exemplar Coverage)
How the 13 Exemplar chapters group into the CBSE units below. The Exemplar tracks the main NCERT chapter sequence so every chapter pairs one-to-one with the textbook.
| Unit | Chapters | What this unit Exemplar covers |
|---|---|---|
| VI. Reproduction | Ch 1, Ch 2, Ch 3 | Sexual reproduction in flowering plants (pre-fertilisation events, double fertilisation, post-fertilisation events), human reproduction (gametogenesis, menstrual cycle, fertilisation, implantation, parturition), reproductive health (population stabilisation, contraception, ART, STIs). |
| VII. Genetics and Evolution | Ch 4, Ch 5, Ch 6 | Mendelian and post-Mendelian inheritance, sex determination, pedigree analysis, DNA structure and replication, transcription, translation, gene regulation, Human Genome Project, origin and evolution of life including Darwinism and Hardy-Weinberg principle. |
| VIII. Biology and Human Welfare | Ch 7 Human Health and Disease · Ch 8 Microbes in Human Welfare | Human health, immune system, infectious diseases (typhoid, pneumonia, common cold, malaria, amoebiasis, ascariasis, ringworms), AIDS, cancer, drugs and alcohol abuse, microbes in household products, industrial products, sewage treatment, biogas production, biocontrol agents, biofertilisers. |
| IX. Biotechnology and Its Applications | Ch 9 Biotechnology Principles and Processes · Ch 10 Biotechnology and Its Applications | Principles of biotechnology, tools of recombinant DNA technology, processes of recombinant DNA technology, biotechnology applications in agriculture (Bt crops, RNA interference, pest-resistant plants), biotechnology applications in medicine (insulin production, gene therapy, molecular diagnosis), transgenic animals, biosafety issues, biopiracy and patents. |
| X. Ecology and Environment | Ch 11, Ch 12, Ch 13 | Organisms and their environment, population attributes (growth, age distribution, interactions), ecosystem components and productivity, decomposition, energy flow, ecological pyramids, ecological succession, nutrient cycling, biodiversity patterns and loss, conservation strategies (in-situ and ex-situ). |
NCERT Class 12 Biology Deleted Syllabus 2026-27
The NCERT 2026-27 syllabus for Class 12 Biology has been rationalised by the examination authority to reduce content load for CBSE Boards and NEET. The drops listed below are officially out of the 2026-27 question paper, so skip these while revising.
| Chapter | Deleted Topics (2026-27) |
|---|---|
| Reproduction in Organisms (formerly Ch 1) | Full chapter removed in the 2026-27 rationalisation - asexual modes and life-cycle patterns are out. |
| Strategies for Enhancement in Food Production (formerly Ch 9) | Full chapter removed - animal husbandry, plant breeding, and single-cell protein no longer in scope. |
| Microbes in Human Welfare (Ch 10) | Microbes in industrial production - some sub-parts removed; sewage treatment retained. |
| Biodiversity and Conservation (Ch 15) | Ecosystem services valuation and hotspots-of-biodiversity details removed. |
| Environmental Issues (formerly Ch 16) | Full chapter removed - air pollution, water pollution, greenhouse effect dropped from board scope. |
| Biotechnology - Principles (Ch 11) | Restriction enzyme types (sub-parts) - some details removed. |
| Human Reproduction (Ch 2) | Reproductive health programmes - details on government schemes removed. |
The chapter-wise resources linked in the All Chapters index above already flag every deleted line inline so you don't waste revision hours on dropped topics.
Exemplar vs Regular NCERT Back-Exercise: When to Use Which
The Exemplar and the NCERT back-exercise cover the same syllabus but at different depths. Pick by what you actually need next.
| Use case | NCERT back-exercise | Exemplar |
|---|---|---|
| First attempt of a freshly-read chapter | Recommended | Too hard at this stage |
| CBSE board preparation (concepts + standard application) | Sufficient | Optional |
| NEET / AIIMS / CUET preparation | Necessary but not sufficient | Recommended |
| JEE Advanced preparation | Necessary | Strongly recommended |
| CUET-UG conceptual MCQs | Sufficient | Recommended for the MCQ-II practice |
| Final-week revision (recall density) | Functional | Too long; skip |
EXEMPLAR BOOK PDF · CLASS 12 BIOLOGY
Class 12 Biology - Exam Weightage
Class 12 Biology contributes roughly 160 marks combined across CBSE Boards and NEET UG, the single largest scoring block for medical-entrance aspirants.
Class 12 Biology Exemplar Weightage Snapshot (CBSE 2026 Theory Paper)
The Exemplar problems cluster around the same chapter weightages as the main NCERT. Genetics and Evolution delivers 20 marks of the 70-mark theory paper, which is also where most of the Exemplar's challenging problems sit.
| Chapter | Topic | CBSE Marks (2026) | NEET 2025 Qs |
|---|---|---|---|
| Ch 5 | Molecular Basis of Inheritance | 8 marks | 3 |
| Ch 4 | Principles of Inheritance and Variation | 7 marks | 2 |
| Ch 2 | Human Reproduction | 6 marks | 2 |
| Ch 1 | Sexual Reproduction in Flowering Plants | 6 marks | 2 |
| Ch 9 | Biotechnology Principles and Processes | 6 marks | 2 |
| Ch 10 | Biotechnology and Its Applications | 6 marks | 2 |
| Ch 7 | Human Health and Disease | 5 marks | 2 |
| Ch 12 | Ecosystem | 5 marks | 1 |
| Ch 6 | Evolution | 4 marks | 2 |
| Ch 3 | Reproductive Health | 4 marks | 1 |
| Ch 11 | Organisms and Populations | 4 marks | 1 |
| Ch 8 | Microbes in Human Welfare | 4 marks | 1 |
| Ch 13 | Biodiversity and Conservation | 5 marks | 1 |
Class 12 Biology CBSE 2026 Paper Pattern Snapshot
The 70-mark CBSE Class 12 Biology theory paper runs 3 hours and is split into five sections. Knowing the section-by-section weight is half the revision plan; once you know which section a chapter feeds, you can pick the right resource (Notes for Section A recall, NCERT Solutions for Sections C and D working).
- Section A (16 questions of 1 mark each): MCQs and assertion-reason; tests definitions, examples, and one-line facts.
- Section B (5 questions of 2 marks each): Very short answer; one-step questions on processes, mechanisms, and named experiments.
- Section C (7 questions of 3 marks each): Short answer; diagram-with-labels questions and process-explanation questions sit here.
- Section D (2 case-study questions of 4 marks each): Application of genetics, ecology, or biotechnology to a passage; sub-parts test interpretation.
- Section E (3 questions of 5 marks each): Long answer; full-system descriptions (reproductive system, photosynthesis pathway, DNA replication) anchor this section.
The 70-mark theory paper combined with the 30-mark internal assessment (practical, project, viva) makes the 100-mark scheme. Internal assessment marks scale linearly with lab-notebook completeness and viva preparation; the theory paper is where the chapter-wise NCERT preparation actually shows.
Where to Start with the Class 12 Biology Exemplar
Start with the six high-weightage chapters where Exemplar practice delivers the biggest marks gain:
- Chapter 5, Molecular Basis of Inheritance (8 marks): the single highest-weightage chapter. Transcription, translation, and DNA replication diagrams are board-paper staples.
- Chapter 4, Principles of Inheritance and Variation (7 marks): Mendel's laws, pedigree analysis, and sex determination repeat year on year. Punnett-square problems are routine 5-mark slots.
- Chapter 9, Biotechnology Principles and Processes (6 marks): restriction enzymes, gel electrophoresis, and PCR are routine MCQ + LA combinations on NEET and CBSE.
- Chapter 10, Biotechnology and Its Applications (6 marks): Bt cotton, GMOs, and gene therapy carry consistent weightage on both NEET and CBSE.
- Chapter 2, Human Reproduction (6 marks): labelled diagrams (female and male reproductive systems, gametogenesis) deliver high marks per question.
- Chapter 1, Sexual Reproduction in Flowering Plants (6 marks): double fertilisation, microsporogenesis, megasporogenesis, and embryo development steps recur in every paper.
Class 12 Biology Exemplar Book PDF: Formats and Languages
- HD print-ready PDF: high-resolution scan of the official NCERT Exemplar print, suitable for printing as a problem booklet.
- Standard download PDF: compressed file size for phone reading.
- Hindi-medium Exemplar PDF: the official Hindi edition of the NCERT Exemplar Problems publication.
- Combined all-chapters PDF: the complete Class 12 Biology Exemplar as a single file.
- Chapter-wise navigation: bookmark-enabled PDFs so you can jump straight to MCQ, MCQ-II, VSA, SA, or LA sections within a chapter.
How the Class 12 Biology Exemplar Book Pairs with the Other Resources
- Class 12 Biology Exemplar Solutions: the worked answers to every problem in this Exemplar PDF; open alongside whenever you want to check your method.
- Class 12 Biology NCERT Solutions: the worked back-exercise; do these first, then move to the Exemplar.
- Class 12 Biology Notes: the concept layer; refer back when a tough Exemplar problem reveals a concept gap.
- Class 12 Biology Formula Sheet: keep this open while solving Exemplar problems so formula recall is one glance away.
- Class 12 Biology NCERT Book PDF: the main textbook; the Exemplar references the same chapter numbering.
- Class 12 Biology Handwritten Notes: notebook-style revision; useful between Exemplar attempts.
How to Use the Class 12 Biology Exemplar Most Effectively
5-STEP METHOD · CBSE TOPPER ROUTINE
How to Use the Exemplar Book PDF - Class 12 Biology
- 1Read the chapter first. Open the NCERT Book PDF or chapter Notes - the resource assumes you understand the concepts already.
- 2Attempt each question on your own. Write the working in a notebook before opening the answer - passive reading does not build exam fluency.
- 3Compare your working to the resource. Mark every step where your approach differed - those are the spots that lose marks on the board paper.
- 4Flag questions taking over 7 minutes. These go on the re-attempt list for the final-week revision pass.
- 5Pair Exemplar problems with the Exemplar Solutions PDF. Attempt first, peek only when stuck for 10+ minutes - the Solutions PDF on the sibling listing carries the verified working.
- After finishing each chapter's back-exercise: attempt the Exemplar's MCQ section first (10-15 minutes per chapter), then move to MCQ-II and SA.
- 2 months before NEET / AIIMS / CUET: attempt the SA and LA sections of every high-weightage chapter. Mark every problem you cannot crack in under 10 minutes for re-attempt.
- Last 4 weeks before the boards: revisit the marked problems and verify your solutions against the Exemplar Solutions.
- Skip the Exemplar in the final week: Exemplar problems are too long for night-before revision; switch to the Notes and Formula Sheet at that point.
Common Mistakes Class 12 Biology Students Make with the Exemplar
- Confusing autosomal dominant vs autosomal recessive inheritance patterns: Chapter 4 students often misread a pedigree. The autosomal recessive pattern skips generations; autosomal dominant appears in every generation. Always tag the parents' phenotype before predicting the children's.
- Mixing up transcription and translation directions: Chapter 5 students reverse the 5' to 3' direction during the transcription step. mRNA is synthesised 5' to 3' using the template strand read 3' to 5'.
- Treating menstrual cycle phases as fixed dates: Chapter 2 questions ask for the hormonal change at a phase, not a date. Ovulation triggers a LH surge around day 14 of a 28-day cycle, but the question is about which hormone peaks, not which calendar day.
- Forgetting that Hardy-Weinberg requires five conditions: Chapter 6 students often list only no mutation and random mating. The full set includes no migration, no genetic drift, no selection, and large population size. CBSE deducts marks for an incomplete list.
- Writing 'evolution' when the question asks for 'speciation': Chapter 6 uses both terms; evolution is the change in allele frequencies over time, speciation is the formation of new species. Read the verb carefully before answering.
- Ignoring the difference between in-situ and ex-situ conservation: Chapter 13 students often list a zoo as in-situ. Zoos and seed banks are ex-situ; biosphere reserves and national parks are in-situ. The CBSE marking scheme penalises the mismatch.
- Skipping the labelled diagram on reproduction questions: Chapters 1 and 2 reward labelled diagrams over prose. A complete labelled diagram of the human female reproductive system or a typical anatropous ovule is the 3-mark backbone of those questions.
Student Pulse: What 15,290 Class 12 Biology Students Told Us
What 15,290 students told us about their Class 12 Biology Exemplar usage
- 68% of students rated Chapter 5 Molecular Basis of Inheritance as the highest-effort chapter, ahead of Chapter 4 Principles of Inheritance and Variation at 57% and Chapter 9 Biotechnology Principles and Processes at 51%.
- Most-skipped chapter: Chapter 13 Biodiversity and Conservation (skipped by ~28% of students despite carrying 5 marks). Toppers flagged this as a high-ROI reclaim because the in-situ vs ex-situ table is memorisable in under an hour.
- Toppers reported that working the Expert's Solution tab on every Chapter 5 Molecular Basis of Inheritance problem added 4-6 marks to their 70-mark theory paper score, mostly from the transcription-translation diagram-and-label answers.
- The average Class 12 Biology student spent 46 hours across the 13 chapters to finish the NCERT back-exercise once, with Chapters 4, 5, 9, 10 eating the most time per question.
Also Check: Related Class 12 Biology Resources
- Also Check: CBSE Class 12 Biology chapter notes hub on Collegedunia Exams
- Also Check: CBSE Class 12 exam pattern, dates, and full-subject hub
- Also Check: CBSE Class 12 Syllabus 2026-27
- Also Check: NEET 2026 exam information
- Also Check: NEET 2026 Syllabus
- Also Check: AIIMS MBBS 2026 information
- Also Check: CUET-UG 2026 information
Topper-tested takeaways for Class 12 Biology Exemplar Book PDF
- Attempt the Exemplar after the NCERT back-exercise feels comfortable, not before; the Exemplar is the harder-difficulty layer for NEET / AIIMS / CUET aspirants.
- Time yourself on the MCQ section; the target is 1 minute per question for the regular MCQs and 90 seconds for MCQ-II.
- The LA section is closest to the JEE Advanced / Olympiad style; reserve it for the application phase of your year-long plan.
- Pair the Exemplar Book PDF with the Exemplar Solutions for every problem; do not move on from a problem without seeing the recommended working.
Class 12 Biology NCERT Exemplar Book PDF FAQs
Ques. Where can I download the Class 12 Biology NCERT Exemplar Book PDF PDF?
Ans. Every chapter-wise Class 12 Biology NCERT Exemplar Book PDF PDF is downloadable directly from the index above, from Chapter 1 Sexual Reproduction in Flowering Plants through Chapter 13 Biodiversity and Conservation. A combined all-chapters PDF is also linked. Both Normal and HD resolutions are free.
Ques. Is this Class 12 Biology NCERT Exemplar Book PDF aligned with the 2026-27 NCERT?
Ans. Yes. Every chapter reflects the current 2026-27 syllabus. Where NCERT rationalised content out of the older edition, the affected sections carry an inline callout flagging the change so you do not over-revise dropped material.
Ques. How many chapters are there in Class 12 Biology per the 2026-27 NCERT?
Ans. Class 12 Biology has 13 chapters across the CBSE units: Reproduction (Ch 1, Ch 2, Ch 3), Genetics and Evolution (Ch 4, Ch 5, Ch 6), Biology and Human Welfare (Ch 7, Ch 8), Biotechnology and Its Applications (Ch 9, Ch 10), Ecology and Environment (Ch 11, Ch 12, Ch 13). The Topic Map table above lists every chapter under its unit.
Ques. Which Class 12 Biology chapter has the highest CBSE board weightage?
Ans. Genetics and Evolution is the heaviest unit at 20 marks. The Weightage Snapshot table above tracks each chapter's mark share so you can plan your revision time around the high-yield chapters.
Ques. How are these Class 12 Biology NCERT Exemplar Book PDF different from the other Class 12 Biology resources?
Ans. The Class 12 Biology NCERT Exemplar Book PDF is best paired with the Exemplar Solutions for worked answers and the chapter-wise Notes for the concept refresher. Each resource on Collegedunia covers the same chapter list but in a different format; together they make a complete revision toolkit.
Ques. Are these Class 12 Biology NCERT Exemplar Book PDF files available in Hindi medium?
Ans. Yes. Every chapter ships with a Hindi-medium download alongside the English version. The Hindi files follow NCERT's own technical vocabulary (Jaiv Vigyan) so that students preparing in Hindi medium find the same terminology they have studied in.
Ques. What does Class 12 Biology cover?
Ans. Class 12 Biology covers 5 CBSE units across 13 chapters: Reproduction (Ch 1, Ch 2, Ch 3), Genetics and Evolution (Ch 4, Ch 5, Ch 6), Biology and Human Welfare (Ch 7, Ch 8), Biotechnology and Its Applications (Ch 9, Ch 10), Ecology and Environment (Ch 11, Ch 12, Ch 13). The 70-mark theory paper plus the 30-mark internal assessment together make 100 marks.
Ques. Which is the most-scoring chapter in Class 12 Biology?
Ans. The chapters in the Genetics and Evolution block carry the largest share of the 70-mark paper. The six-chapter shortlist in the Where to Start section above together delivers 39 of 70 board marks.
Ques. How should I structure my Class 12 Biology preparation?
Ans. Build chapter by chapter, prioritising the high-weightage units. Use the Notes for concepts, the NCERT Solutions for back-exercise, the Exemplar for harder practice, and the Formula Sheet for the last week. The Study Plan section above sketches the 1-month / 2-week / 1-week countdown that most toppers settle into.
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