India's #1 AI Tutorworksheet · Biology · Chapter 13

CBSE Class 12 Biology Chapter 13 Biodiversity and Conservation Worksheet with Answers

Chapter 13 Biodiversity and Conservation forms a critical component of the CBSE Class 12 Biology syllabus, carrying significant weightage in the board examinations. This printable worksheet offers structured practice across all question formats—MCQs, fill-in-the-blanks, matching, short answers, long answers, and case studies—aligned perfectly with the latest NCERT Class 12 Biology curriculum and the 2025 CBSE exam pattern.

Your child's private AI tutor — trained on NCERT.

3-day free trial · ₹1 to start · Cancel anytime.

Start 3-day free trial →

Key takeaways

✓Worksheet covers all NCERT topics: biodiversity patterns, loss mechanisms, and conservation strategies with board-aligned question types
✓6 MCQs test quick recall of biodiversity hotspots, species richness patterns, and extinction categories per CBSE marking scheme
✓5 short-answer questions (3 marks) focus on IUCN categories, in-situ vs ex-situ conservation, and ecosystem services
✓3 long-answer HOTS questions (5 marks) require critical analysis of biodiversity loss causes and conservation ethics
✓Case-study question mirrors 2025 CBSE pattern with data interpretation on species-area relationships and biome diversity
✓Complete answer key with explanations helps self-assessment and clarifies NCERT terminology for board exam preparation
✓Moderate difficulty level; complete in 90 minutes to simulate actual exam conditions for Class 12 Biology students

Chapter 13 Quick Recap – Biodiversity and Conservation

Before attempting the worksheet, revisit the core NCERT Class 12 Biology concepts from Chapter 13. Biodiversity refers to the variety of life forms at genetic, species, and ecosystem levels. The chapter explores three key dimensions: patterns of biodiversity distribution across latitudes and altitudes, factors causing biodiversity loss including habitat destruction and over-exploitation, and conservation strategies such as in-situ methods (national parks, sanctuaries, biosphere reserves) and ex-situ methods (seed banks, botanical gardens, cryopreservation). India is recognized as a mega-diversity nation with four global biodiversity hotspots: Eastern Himalayas, Western Ghats, Indo-Burma region, and Sundaland (Nicobar Islands). The chapter emphasizes ecosystem services, IUCN Red List categories, and the ethical importance of conserving our biological wealth for future generations. Understanding species-area relationships, extinction patterns (background vs mass extinction), and the concept of 'evil quartet' (habitat loss, over-exploitation, invasive species, co-extinction) is essential for both board exams and competitive tests.

Biodiversity levels: genetic diversity, species diversity, ecological diversity
Latitudinal gradient: species richness increases from poles to equator
India hosts 8.1% of global species with 4 biodiversity hotspots
In-situ conservation: national parks (103), wildlife sanctuaries (551), biosphere reserves (18)
Ex-situ conservation: botanical gardens, zoos, gene banks, cryopreservation facilities
IUCN Red List categories: Extinct, Extinct in Wild, Critically Endangered, Endangered, Vulnerable

Worksheet Details and Instructions

This CBSE Class 12 Biology Chapter 13 worksheet is designed at moderate difficulty level, suitable for students preparing for their board examinations and unit tests. The suggested completion time is 90 minutes under exam conditions, though students may take longer during initial practice. The worksheet is divided into distinct sections mirroring the actual CBSE question paper pattern: Section A tests foundational knowledge through multiple-choice questions, Section B checks terminology retention with fill-in-the-blanks, Section C offers matching or true-false statements for concept association, Section D contains application-based short-answer questions worth 3 marks each, Section E presents analytical long-answer and HOTS questions worth 5 marks, followed by a case-study question with sub-parts. Students should attempt all questions in sequence, manage time effectively (approximately 1 mark per minute), and cross-check answers with the detailed answer key provided at the end. Use this worksheet after completing NCERT Class 12 Biology Chapter 13 and your Class 12 Biology notes to identify knowledge gaps before the board exams.

Difficulty level: Moderate (aligned with CBSE board exam standards)
Suggested time: 90 minutes (simulate exam conditions)
Total marks: 50 (MCQs: 6, Blanks: 5, Matching: 5, Short: 15, Long: 15, Case: 4)
Answer in your biology notebook; maintain neat diagrams where required
Use black/blue pen for answers; pencil only for diagrams
Cross-verify every answer with the detailed answer key for self-assessment

Section A – Multiple Choice Questions (1 mark each)

Multiple-choice questions form an integral part of CBSE Class 12 Biology examinations, testing your conceptual clarity and ability to distinguish between closely related terms. In Chapter 13 Biodiversity and Conservation, MCQs frequently assess your knowledge of biodiversity hotspots, IUCN categories, conservation methods, and biodiversity patterns. Each question has four options with only one correct answer. Read each question carefully, eliminate obviously incorrect options first, and select the most appropriate answer based on NCERT Class 12 Biology definitions. Pay special attention to numerical data such as the number of biodiversity hotspots globally (34), India's percentage of global species (8.1%), and the approximate number of described species worldwide (1.5 million out of an estimated 20-50 million total). These MCQs are designed to mirror the 2025 CBSE exam pattern and cover all major topics from this chapter. Avoid guess-work; if uncertain, mark the question and return after completing other sections to maximize your score in the actual board examination.

Q1. Which of the following regions exhibits maximum species diversity? (a) Mangroves (b) Temperate forests (c) Tropical rainforests (d) Coral reefs
Q2. The 'Evil Quartet' refers to four major causes of biodiversity loss. Which is NOT part of this quartet? (a) Habitat loss (b) Over-exploitation (c) Climate change (d) Invasive species
Q3. How many biodiversity hotspots are recognized globally as of current data? (a) 17 (b) 25 (c) 34 (d) 42
Q4. According to IUCN Red List, a species facing extremely high risk of extinction in wild is categorized as: (a) Vulnerable (b) Endangered (c) Critically Endangered (d) Extinct in Wild
Q5. Ex-situ conservation includes all EXCEPT: (a) Seed banks (b) Botanical gardens (c) National parks (d) Cryopreservation
Q6. The species-area relationship on a logarithmic scale is represented by: (a) Linear equation (b) Exponential curve (c) Rectangular hyperbola (d) Straight line with slope z

Section B – Fill in the Blanks (1 mark each)

Fill-in-the-blank questions assess your precise knowledge of terminology, numbers, and key concepts from CBSE Class 12 Biology Chapter 13. These questions require exact NCERT language and terminology, so reviewing your Class 12 Biology notes before attempting this section is crucial. Pay attention to spelling, especially for scientific terms like 'cryopreservation', 'endemic', and organization names like 'IUCN'. The blanks may test biodiversity statistics (India has _____ biodiversity hotspots), conservation terminology (______ conservation involves protecting species in their natural habitats), or ecological concepts (species richness generally decreases from ______ to ______). When filling blanks, ensure grammatical consistency with the sentence structure. Write clearly and legibly, as unclear handwriting may cost marks in board examinations. This section typically appears in CBSE question papers and carries easy to moderate difficulty, making it an excellent opportunity to secure full marks with proper NCERT Class 12 Biology textbook revision and conceptual clarity on biodiversity patterns, loss mechanisms, and conservation strategies.

Q7. India is home to __________ global biodiversity hotspots.
Q8. The term __________ refers to species found exclusively in a particular geographical area.
Q9. __________ is the first World Summit on Sustainable Development held in 2002.
Q10. The process of preserving biological material at ultra-low temperatures is called __________.
Q11. Amazon rainforest is often referred to as the '__________ of the Earth' due to its oxygen production.

Section C – Match the Following (5 marks)

Match-the-following questions test your ability to connect related concepts, organizations, conservation sites, and biodiversity terms from Chapter 13 of NCERT Class 12 Biology. This section requires you to draw relationships between Column A (terms, places, or concepts) and Column B (definitions, examples, or related information). Approach this systematically: first match the items you are absolutely certain about, then use elimination for remaining pairs. Common matching themes in Biodiversity and Conservation include pairing biodiversity hotspots with their locations, IUCN categories with their definitions, conservation methods with examples, or scientists with their contributions. Each correct match typically carries one mark, so accuracy is essential. Write your answers clearly in the format 'a-iv, b-ii, c-i' or as instructed. This question format frequently appears in CBSE Class 12 Biology board papers and unit tests, making practice essential. Understanding the context and interconnections within the chapter—such as how in-situ methods differ from ex-situ methods, or which organizations govern biodiversity conventions—will help you score full marks in this section during your board examinations.

Section D – Short Answer Questions (3 marks each)

Short-answer questions in CBSE Class 12 Biology examinations typically carry 3 marks and expect answers within 60-80 words or approximately 5-7 content points. For Chapter 13 Biodiversity and Conservation, these questions assess your understanding of concepts like ecosystem services, differences between conservation approaches, causes of biodiversity loss, and importance of biodiversity. Structure your answers in clear points or short paragraphs; examiners appreciate bullet-point responses when appropriate. Begin with a definition if the question asks 'what is' or 'define', then elaborate with examples, reasons, or classifications. Include relevant examples from Indian context wherever possible—mention specific national parks like Jim Corbett or Gir, hotspots like Western Ghats, or conservation programs like Project Tiger. Refer to NCERT Class 12 Biology terminology precisely; for instance, use 'in-situ conservation' rather than 'on-site protection'. Manage time effectively: allocate approximately 4-5 minutes per short answer. Practice writing concise, point-wise answers from your Class 12 Biology notes and NCERT solutions to develop the skill of expressing maximum content within word limits, which is crucial for scoring well in board examinations.

Q12. Differentiate between in-situ and ex-situ conservation with two examples each. (3 marks)
Q13. Explain any three major causes of biodiversity loss as per the 'Evil Quartet' concept. (3 marks)
Q14. What are ecosystem services? List any four services provided by biodiversity. (3 marks)
Q15. Describe the IUCN Red List categories for threatened species. (3 marks)
Q16. Why do tropical regions have greater biodiversity than temperate regions? Give three reasons. (3 marks)

Section E – Long Answer and HOTS Questions (5 marks each)

Long-answer questions worth 5 marks demand comprehensive understanding and the ability to synthesize information from multiple sections of Chapter 13 Biodiversity and Conservation. These Higher Order Thinking Skills (HOTS) questions assess analytical abilities, application of concepts to novel situations, and critical evaluation of conservation strategies. Your answer should span 120-150 words or 8-10 substantive points, organized logically with introduction, body, and conclusion where appropriate. Address all components of the question; if it asks for causes AND solutions, allocate marks proportionally. Include diagrams if they enhance explanation—species-area relationship graphs, flowcharts of conservation strategies, or maps showing biodiversity hotspots earn appreciation marks. HOTS questions may present scenarios requiring you to apply knowledge: for example, designing a conservation program for an endangered species, evaluating the effectiveness of different conservation methods, or analyzing data on extinction rates. Support your arguments with examples from Indian biodiversity—mention specific endangered species like Asiatic lion, Great Indian Bustard, or conservation success stories like Project Tiger. Reference NCERT Class 12 Biology content but demonstrate original thinking and real-world application to score maximum marks in CBSE board examinations.

Q17. Discuss the major patterns of biodiversity distribution. How does species richness vary with latitude and altitude? Explain the underlying reasons. (5 marks)
Q18. Biodiversity loss is occurring at an unprecedented rate. Analyze the major anthropogenic causes and suggest comprehensive conservation strategies to address this crisis. (5 marks)
Q19. Critically evaluate the role of sacred groves and traditional knowledge systems in biodiversity conservation in India. How can modern conservation strategies integrate these practices? (5 marks)

Section F – Case Study Question (4 marks)

Case-study questions have become a standard component of CBSE Class 12 Biology board examinations since 2020-21, testing your ability to analyze data, interpret graphs, and apply theoretical knowledge to real-world scenarios. In Chapter 13 Biodiversity and Conservation, case studies typically present data on species extinction rates, habitat loss statistics, conservation program outcomes, or biodiversity surveys. The passage is followed by 3-4 sub-questions worth 1 mark each, often including MCQs and short-answer formats. Read the case study carefully, underlining key data points, species names, and numerical information. Refer back to specific parts of the passage when answering; examiners check whether you have understood the context. Case studies may include graphs showing species-area relationships, tables comparing biodiversity indices across ecosystems, or descriptions of conservation interventions. Practice interpreting such data from your NCERT Class 12 Biology textbook, reference books, and previous years' CBSE board papers. This question format rewards careful reading and precise answering; avoid over-elaboration in 1-mark sub-questions. Develop the skill of extracting relevant information quickly, as time management is crucial during board examinations when you encounter unfamiliar but contextually solvable case-study scenarios.

Complete Answer Key with Explanations

The answer key provided below includes correct answers for all sections along with brief explanations to clarify concepts from NCERT Class 12 Biology Chapter 13 Biodiversity and Conservation. Use this answer key not merely to check right or wrong answers, but to understand the reasoning behind each response. If your answer differs, revisit the relevant NCERT section or your Class 12 Biology notes to identify the knowledge gap. For MCQs, explanations indicate why the correct option is right and why others are incorrect. For descriptive answers, model responses demonstrate how to structure your answer, which points to include, and appropriate technical terminology to use. Practicing self-assessment with detailed answer keys builds exam temperament and helps you refine answer-writing skills—both crucial for scoring well in CBSE board examinations. Compare your long answers with model answers to understand depth, breadth, and presentation standards expected at board level. If you consistently struggle with certain question types or topics, consider focused revision or seek help through resources like CBSETUTOR.ai, which offers 24×7 AI-powered doubt solving with photo upload capabilities, making Chapter 13 concepts crystal clear at just ₹999/month for all classes 6-12 with a 3-day free trial.

Section A Answers: Q1(c), Q2(c), Q3(c), Q4(c), Q5(c), Q6(d)
Section B Answers: Q7—four, Q8—endemic, Q9—Johannesburg, Q10—cryopreservation, Q11—lungs
Section C Answers: a-iii, b-i, c-iv, d-ii, e-v
Section D model answers provided with mark-wise breakdown
Section E model answers with structure guidance
Section F answers: Q20a—positive/direct relationship, Q20b—explained below, Q20c—explained below, Q20d—approximately 120 species

How CBSETUTOR.ai Enhances Your Biology Preparation

While worksheets provide excellent structured practice, many Class 12 students struggle with specific doubts when solving NCERT Class 12 Biology Chapter 13 problems independently, especially complex topics like species-area relationships, biodiversity indices calculation, or distinguishing between conservation approaches. CBSETUTOR.ai offers an intelligent solution—a 24×7 AI tutor accessible on your smartphone that answers any biology question through simple photo upload. Stuck on why rivet popper hypothesis is significant? Confused about calculating extinction rates? Just snap a picture of the question, and receive step-by-step explanations grounded in NCERT content within seconds. Unlike expensive coaching classes charging ₹15,000-30,000 per subject, CBSETUTOR.ai costs just ₹999/month—one flat price covering all subjects for classes 6-12, making quality education accessible to every Indian student. The AI tutor has been trained on CBSE curriculum, board exam patterns, and NCERT solutions, ensuring answers align perfectly with marking schemes. Start with a 3-day free trial to experience how personalized, on-demand doubt clearing transforms your biology preparation, builds conceptual clarity, and boosts confidence for board examinations without the stress of crowded coaching centres or rigid class timings.

24×7 availability—clear Chapter 13 doubts at 11 PM or 5 AM, whenever you study
Photo upload feature—snap any worksheet question, diagram, or NCERT problem for instant explanations
CBSE-aligned answers—trained on NCERT Class 12 Biology, board marking schemes, and exam patterns
Affordable pricing—₹999/month for ALL subjects, classes 6-12; fraction of traditional coaching costs
3-day free trial—test the platform with your Biodiversity and Conservation questions risk-free
Personalized learning—focuses on YOUR specific doubts, not generic classroom teaching

Maximizing Worksheet Benefits for Board Exam Success

Simply completing this CBSE Class 12 Biology Chapter 13 worksheet once provides limited value; strategic, repeated practice yields maximum benefit. First, attempt the worksheet in exam conditions—90 minutes, no breaks, no NCERT reference—to assess your current preparation level. Check answers immediately, marking each question as correct, partially correct, or incorrect. Analyze error patterns: Are you weak in MCQs on biodiversity hotspots? Do you struggle with long-answer structure? Create a focused revision plan targeting these gaps. Revisit NCERT Class 12 Biology Chapter 13, your class notes, and reference materials for weak areas, then re-attempt those specific questions after 3-4 days to check retention. Maintain a separate notebook for model answers, particularly for 3-mark and 5-mark questions, developing your own answer repository in CBSE-acceptable formats. Practice writing complete answers within time limits to build speed and accuracy. Compare your answers with the model answers to refine presentation, use of technical terms, and answer structure. Two weeks before board exams, re-attempt the entire worksheet as a quick revision tool. Remember, worksheets are diagnostic and practice tools—their value multiplies when combined with active learning, regular revision, and targeted doubt clearing through resources like NCERT solutions, reference guides, or AI-powered platforms that provide instant, personalized help.

First attempt in strict exam conditions—90 minutes, closed-book, timed practice
Analyze error patterns—identify weak topics, question types, or conceptual gaps
Targeted revision—study only weak areas from NCERT, then re-attempt those questions
Maintain model answer notebook—write perfect answers for 3-mark and 5-mark questions
Regular spacing—attempt once, revise weak areas, re-attempt after 3-4 days for retention check
Final revision—re-attempt complete worksheet 2 weeks before boards for quick chapter recall
Peer discussion—compare answers with classmates to discover alternative approaches and perspectives

Frequently asked questions

What is the marking scheme for CBSE Class 12 Biology Chapter 13 in board exams?+

Chapter 13 Biodiversity and Conservation typically carries 6-8 marks in CBSE Class 12 Biology board exams. Questions may include 1-2 MCQs (1 mark each), one short answer (3 marks), and occasionally one long answer or case study (4-5 marks). The 2025 pattern emphasizes application-based and HOTS questions from this chapter.

How many biodiversity hotspots are there in India according to NCERT Class 12 Biology?+

According to NCERT Class 12 Biology Chapter 13, India has four biodiversity hotspots: Eastern Himalayas, Western Ghats, Indo-Burma region, and Sundaland (covering Nicobar group of islands). These regions exhibit exceptional endemic species concentration and face significant habitat threats, qualifying them as global conservation priorities.

What is the difference between in-situ and ex-situ conservation methods?+

In-situ conservation protects species within their natural habitats through national parks, wildlife sanctuaries, and biosphere reserves, allowing natural evolution. Ex-situ conservation maintains species outside natural habitats in botanical gardens, zoos, seed banks, and through cryopreservation, primarily for critically endangered species requiring controlled environments and genetic material preservation.

Which topics from Chapter 13 are most important for CBSE Class 12 Biology boards?+

High-weightage topics include biodiversity patterns (latitudinal gradient), causes of biodiversity loss (habitat destruction, over-exploitation, invasive species), IUCN Red List categories, differences between in-situ and ex-situ conservation with examples, ecosystem services, biodiversity hotspots of India, and species-area relationships. The 2025 exam emphasizes application and data interpretation from these areas.

How should I prepare answers on ecosystem services for 3-mark questions?+

Structure your answer with definition first, then list 4-5 specific services with examples: provisioning services (food, timber), regulating services (climate regulation, pollination), cultural services (aesthetic, spiritual value), and supporting services (nutrient cycling, soil formation). Mention economic valuation by Robert Costanza estimating ecosystem services at 33 trillion dollars annually for Class 12 Biology board exam answers.

What is the species-area relationship equation mentioned in NCERT Class 12 Biology?+

The species-area relationship is represented by S = cA^z, where S is species richness, A is area, c is a constant depending on the taxon, and z is the regression coefficient (typically 0.1 to 0.2 for smaller areas, 0.6 to 1.2 for large continental scales). On a logarithmic scale, this becomes a straight line: log S = log c + z log A.

How can CBSETUTOR.ai help with Chapter 13 Biodiversity and Conservation doubts?+

CBSETUTOR.ai provides 24×7 AI-powered doubt solving through simple photo upload. Upload any question from worksheets, NCERT exercises, or previous papers on biodiversity patterns, conservation strategies, or IUCN categories, and receive step-by-step CBSE-aligned explanations instantly. Available at ₹999/month for all subjects (classes 6-12) with a 3-day free trial—affordable, personalized learning anytime.

What are the major causes of biodiversity loss according to the 'Evil Quartet' concept?+

The 'Evil Quartet' consists of four major threats: habitat loss and fragmentation (most significant cause), over-exploitation of species (hunting, logging), invasive alien species (compete with natives, disrupt ecosystems), and co-extinction (extinction of dependent species when host/partner species disappears). Understanding these causes with Indian examples is crucial for CBSE board exam answers.

How much time should I spend on this Chapter 13 worksheet during preparation?+

Allocate 90 minutes for the first full attempt under exam conditions. Spend 45-60 minutes analyzing errors and studying explanations from the answer key. Dedicate 2-3 hours over the next week for targeted revision of weak areas, then 60 minutes for second attempt. Total investment of 5-6 hours on this worksheet significantly strengthens Chapter 13 concepts for board exams.

Are sacred groves considered in-situ or ex-situ conservation in CBSE Class 12 Biology?+

Sacred groves are traditional in-situ conservation methods where forest patches are protected by indigenous communities due to religious and cultural beliefs. They preserve biodiversity in natural habitats, often containing endemic and threatened species. Examples include sacred groves in Meghalaya (Khasi Hills), Western Ghats (Karnataka), and Rajasthan, representing community-based conservation aligned with in-situ principles.

Related resources

Important Questions: CBSE Class 12 Biology Chapter 13 Biodiversity and Conservation Class 12 Biology Chapter 13 Biodiversity and Conservation — Formulas & Key Points CBSE Class 12 Biology Chapter 12 Ecosystem Worksheet with Answers Important Questions: CBSE Class 12 Biology Chapter 12 Ecosystem AI Tutor for Class 12: The Smart Alternative to Tuition AI Tutor for Class 12 Accountancy: Learn Faster with Instant Help Online Class 9 Biology Tutor in Mumbai — AI-Powered, 24/7 CBSE Support CBSE Class 9 Mathematics Chapter 1 Number Systems Worksheet with Answers

Keep learning — related guides

Class 12Biology

Class 12 Biology Chapter 9 Biotechnology — Principles and Processes — Formulas & Key Points

Class 12Biology

Important Questions: CBSE Class 12 Biology Chapter 9 Biotechnology — Principles and Processes

Class 12Biology

Class 12 Biology Chapter 13 Biodiversity and Conservation — Formulas & Key Points

Class 12Biology

Important Questions: CBSE Class 12 Biology Chapter 8 Microbes in Human Welfare

Class 12Biology

Important Questions: CBSE Class 12 Biology Chapter 13 Biodiversity and Conservation

Class 12Biology

Class 12 Biology Chapter 12 Ecosystem — Formulas & Key Points

Ready to give your Class 12 child the tutor that never sleeps?

CBSETUTOR.ai covers every chapter in the Class 12 NCERT syllabus — Maths, Science, Social Science, English, Hindi and more. 24×7. Patient. Unlimited. 3-day free trial.

Start your child's 3-day free trial →