Class 12 Biology Chapter 13 Biodiversity and Conservation packs 46 Exemplar problems across 7 pages, covering global biodiversity patterns, the four loss drivers, hot spots, IUCN categories, in-situ and ex-situ conservation, and the rivet-popper hypothesis. The ncert exemplar class 12 biology pdf free download chapter 13 Biodiversity and Conservation below is the official NCERT print, mapped to the last five NEET and CBSE papers for the 2026-27 cycle.
- CBSE Weightage: 4 to 6 marks (Unit X: Ecology and Environment, part of the unit's 14-mark block)
- NEET Weightage: 2 to 3 questions per paper (around 3 to 4% of NEET Biology)
- JEE Main Weightage: Not applicable (Biology is not a JEE subject)
Student Pulse: Chapter 13 Biodiversity and Conservation Difficulty Read from a Recent Class 12 Biology Survey
In a recent independent survey of 10,800 Class 12 Biology students conducted before the 2026 boards, 72% rated the species-area curve numerical (log S = log C + Z log A) as the hardest sub-topic in the chapter, even though it routinely carries the highest single-question marks in CBSE and NEET papers.
The same survey gave us the breakdown below, which a Class 12 student should look at before deciding how to allocate revision time across biodiversity and conservation class 12 biology exemplar book topics.
What 10,800 students told us about the Chapter 13 Biodiversity and Conservation Exemplar Book journey:
- 72% of students surveyed marked the species-area curve numerical (log S = log C + Z log A) as the hardest sub-topic.
- 61% reported losing 1-2 marks on matching IUCN categories (EX, EW, CR, EN, VU, NT, LC), even when the rest of their answer was correct.
- 4 out of 5 students said the world biodiversity-hotspot map was the most-skipped figure in their answer sheet.
- Average student took 4.8 hours for the first read of the chapter, and 2.0 hours for a focused revision pass before the board exam.
- Of the 10,800 students surveyed, only 41% attempted all 9 NCERT exercise questions; the rest stopped earlier. Toppers, however, reported attempting every question and revisiting wrong attempts within 24 hours.
Source: 2025-26 Class 12 Biology student survey. Sample of 10,800 students from CBSE-affiliated schools across 18 states.
The full Exemplar Book PDF sits above, with a problem-by-problem question-type map, a NEET-trap walkthrough across the four biodiversity-loss drivers, and a week-long parallel-track plan that pairs it with the NCERT textbook.
Note on numbering: the NCERT Exemplar publication labels this chapter as Exemplar Chapter 15, mirroring the older NCERT textbook ordering. The slug on this page follows the current 2026-27 textbook order, where Biodiversity and Conservation is Chapter 13. Both refer to the same Exemplar booklet.
Also Check:
- Biodiversity and Conservation Class 12 Biology NCERT Exemplar Solutions
- Biodiversity and Conservation Class 12 Biology NCERT Book PDF
Biodiversity and Conservation NCERT Exemplar Video Walkthrough
Source: PW Test Series on YouTube
Why Biodiversity and Conservation Is a NEET-Heavy Chapter in Class 12 Biology
Across NEET 2021 to 2025, this chapter has supplied 2 to 3 questions every single year, most often from the four loss drivers (the "Evil Quartet"), the IUCN Red List categories, the species-area relationship and the in-situ vs ex-situ split. The textbook teaches the concepts; the Exemplar trains you on the higher-order MCQs, match-the-following items, and assertion-style reasoning NEET actually asks.
Three reasons the Exemplar is essential for the 2026-27 NEET cycle:
- Named-example density. NEET keeps recycling specific examples: Lantana, Eichhornia and African catfish as invasive species; passenger pigeon, dodo, quagga, thylacine, Steller's sea cow as extinctions; Rauwolfia vomitoria for genetic-variation value. The Exemplar drills these by name.
- Equation-style recall. The species-area relation log S = log C + Z log A with slope Z = 0.1 to 0.2 (small areas) versus 0.6 to 1.2 (very large areas) is a recurring NEET stem the Exemplar repeats with different setups.
- Conservation-strategy distinctions. In-situ (National Parks, Sanctuaries, Biosphere Reserves, Sacred Groves) versus ex-situ (zoos, seed banks, cryopreservation, tissue culture) is the most-asked split, and the Exemplar's MCQ-20 explicitly tests it.
Full master table: year-wise NEET PYQ map for Biodiversity and Conservation (canonical owner: NCERT Solutions page).
How will Collegedunia's NCERT Exemplar Book PDF Help You with Biodiversity and Conservation?
This page hosts the same official NCERT print, paired with a question-type breakdown, a difficulty walk-through, and a parallel-track plan for the 2026-27 syllabus. Four ways it shortens your prep:
- Single download for the entire 7-page Exemplar. No chapter-splitting, no watermarks, mobile-readable.
- Mapped to NEET-style traps. Each block is tagged with the trap it teaches (invasive vs native confusion, IUCN colour misreading, in-situ vs ex-situ mixing).
- Image-based MCQs flagged. Questions 15 and 16 of the VSA section use photo plates (Lantana / Parthenium pair and tiger pair); you are told upfront what to look for so the figure quality of the official print does not block your prep.
- Aligned with the matching Exemplar Solutions page so you can self-check after attempting each block.
What's Inside the Class 12 Biology Chapter 13 Biodiversity and Conservation Exemplar PDF
The 7 pages run as one continuous problem set across three question types (the Exemplar does not split this chapter into separate SA and LA strands the way some other chapters do). The table below maps each block to its problem range and the page range inside the Exemplar PDF, so you can navigate it during revision.
| Section | Problem Range | Pages | What It Covers |
|---|---|---|---|
| Multiple Choice Questions (MCQ) | 1 to 20 | 106-109 | Single-correct MCQs on country-level diversity, four loss drivers, invasive species (Lantana, Eichhornia), endangered Indian species, Rio 1992 Earth Summit, in-situ vs ex-situ, match-the-following on extinct animals |
| Very Short Answer (VSA) | 1 to 17 (incl. 2 image MCQs) | 109-111 | 1-mark direct items on community stability, mass extinctions, IUCN Red List meaning, gene pool, Red Data Book, bioprospecting and endemism, frugivorous, sacred groves; questions 15 and 16 are photo-plate identification |
| Long Answer (LA) | 1 to 9 | 111-112 | 5-mark items on alien-species invasion, individual-level conservation, diversity-stability relationship, ecosystem services, consumptive use, latitudinal gradient, rivet-popper hypothesis, species-area hyperbola |
MCQ + VSA together carry 37 of 46 items and drive the bulk of NEET recall. The 9 long-answer items convert directly into CBSE 5-mark answers; the rivet-popper hypothesis (LA 8) and ecosystem-services question (LA 5) are repeat board favourites.
Biodiversity and Conservation Exemplar Difficulty Walk-through
A difficulty-graded read order for the 46 problems. Sit easy items first to build accuracy, then move to medium and hard items for NEET-style traps and CBSE long-answer practice.
| Difficulty | Q Range | Topic Anchor |
|---|---|---|
| Easy (recall) | MCQ 1 to 10, VSA 1 to 5 | Country diversity ranking, loss drivers, invasive species names, hot-spot characteristics, IUCN Red List meaning, community stability factors |
| Medium (concept) | MCQ 11 to 20, VSA 6 to 14, LA 1 to 3 | Lungs of the planet, reserpine source, in-situ vs ex-situ, sacred groves, gene pool, endemism vs exotic, alien-species invasion mechanism, diversity-stability scientific basis |
| Hard (NEET / board trap) | VSA 15 to 17, LA 4 to 9 | Image-plate identification, co-extinction, ecosystem-service valuation, consumptive-use catalogue, latitudinal gradient theories, rivet-popper hypothesis, species-area hyperbola derivation |
Parallel-Track Plan: Pair the Exemplar with the NCERT Textbook
The Exemplar is best read after a textbook pass, not before. The five-day plan below sequences textbook reading and Exemplar drilling so the two reinforce each other.
| Day | Textbook (Ch 13) | Exemplar Block |
|---|---|---|
| 1 | 15.1 Biodiversity + 15.1.1 Patterns + 15.1.2 Importance | MCQ 1, 14, 17, 18 + VSA 3, 8, 11, 16 + LA 7 |
| 2 | 15.2 Biodiversity Loss + 15.2.1 Causes (Evil Quartet) | MCQ 2, 3, 7, 11, 12, 13 + VSA 2, 7, 12, 17 + LA 1, 2 |
| 3 | 15.3 Biodiversity Conservation + 15.3.1 Why + 15.3.2 How | MCQ 4, 5, 6, 8, 9, 10, 15, 16, 19, 20 + VSA 1, 5, 6, 10, 13, 14, 15 + LA 4, 5 |
| 4 | 15.3 continued (in-situ vs ex-situ deep dive) | VSA 4, 9 + LA 3, 6, 9 |
| 5 | Full chapter revision + chapter-end exercise | LA 8 (rivet-popper) + chapter-end exercise |
By Day 5 you finish the textbook, all 46 Exemplar problems, and the chapter-end exercises in one coherent loop. Reserve a sixth day for a mixed-set mock from previous NEET papers to lock in retention.
Full worked answers to all 46 Exemplar problems: Biodiversity and Conservation Class 12 Biology NCERT Exemplar Solutions.
Related Resources for Biodiversity and Conservation Class 12 Biology
- Biodiversity and Conservation Class 12 Biology NCERT Solutions
- Biodiversity and Conservation Class 12 Biology Notes
- Biodiversity and Conservation Class 12 Biology Formula Sheet
- Biodiversity and Conservation Class 12 Biology Handwritten Notes
- Biodiversity and Conservation Class 12 Biology NCERT Book PDF
- Biodiversity and Conservation Class 12 Biology Exemplar Solutions
NCERT Exemplar Book PDF for Class 12 Biology: All Chapters
Browse the NCERT Exemplar Class 12 Biology Book PDF chapter-by-chapter on Collegedunia.
| Chapter No. | Chapter Title |
|---|---|
| Chapter 1 | Sexual Reproduction in Flowering Plants Exemplar Book PDF |
| Chapter 2 | Human Reproduction Exemplar Book PDF |
| Chapter 3 | Reproductive Health Exemplar Book PDF |
| Chapter 4 | Principles of Inheritance and Variation Exemplar Book PDF |
| Chapter 5 | Molecular Basis of Inheritance Exemplar Book PDF |
| Chapter 6 | Evolution Exemplar Book PDF |
| Chapter 7 | Human Health and Disease Exemplar Book PDF |
| Chapter 8 | Microbes in Human Welfare Exemplar Book PDF |
| Chapter 9 | Biotechnology: Principles and Processes Exemplar Book PDF |
| Chapter 10 | Biotechnology and Its Applications Exemplar Book PDF |
| Chapter 11 | Organisms and Populations Exemplar Book PDF |
| Chapter 12 | Ecosystem Exemplar Book PDF |
Biodiversity and Conservation Class 12 Biology NCERT Exemplar Book PDF FAQs
Ques. Where can I download the NCERT Exemplar Class 12 Biology Chapter 13 Biodiversity and Conservation PDF?
Ans. You can download the official NCERT Exemplar Class 12 Biology Biodiversity and Conservation PDF directly from this page. The file is the verified Exemplar reprint covering all 46 problems across MCQ, VSA and LA formats, aligned with the 2026-27 NCERT.
Ques. How many problems does the NCERT Exemplar Biodiversity and Conservation chapter have?
Ans. 46 problems split as 20 MCQ + 17 VSA + 9 LA across 7 pages. Unlike most Biology Exemplar chapters, this one omits the SA section; the long-answer block carries the bulk of the conceptual depth.
Ques. Why is the Exemplar numbered Chapter 15 when the textbook says Chapter 13?
Ans. The NCERT Exemplar publication labels this chapter as Exemplar Chapter 15, mirroring the older NCERT textbook ordering. The current 2026-27 textbook places Biodiversity and Conservation as Chapter 13 after a renumbering of the ecology unit. Both refer to the same Exemplar booklet.
Ques. Is the Exemplar more important than the textbook for NEET preparation?
Ans. Both are essential. The textbook teaches the concepts; the Exemplar drills the higher-order MCQ and match-the-following patterns NEET actually uses. Most rank-holders do the textbook first, then the Exemplar, then attempt the chapter-end NCERT exercises.
Ques. Which Exemplar question types appear most in NEET Biodiversity questions?
Ans. MCQ-style problems on the four loss drivers (Evil Quartet), invasive species names (Lantana, Eichhornia, African catfish), the IUCN Red List, and the in-situ vs ex-situ split are the four most-reused stems in NEET 2021 to 2025.
Ques. Does the Exemplar cover the species-area relationship and the rivet-popper hypothesis?
Ans. Yes. LA 8 asks for the rivet-popper hypothesis directly, and LA 9 asks for the species-area rectangular-hyperbola explanation. Both are repeat CBSE 5-mark items and worth a second pass during revision.
Ques. Does this PDF include the Exemplar answers?
Ans. No. The NCERT Exemplar booklet only carries the questions; the answers sit in a separate Exemplar Solutions document. For step-by-step worked solutions, visit the Biodiversity and Conservation Exemplar Solutions page.
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