Biodiversity and Conservation — NEET Zoology MCQs with answers

Biodiversity and Conservation is a Class 12 Zoology chapter in the NEET (UG) syllabus. NEET720 has 198 reviewed practice questions on it, each with a quick answer and a step-by-step explanation. The 8 questions below are free and fixed, so you can bookmark this page; the full chapter, plus mistake tracking and spaced revision, is in the app.

Topics covered

Red Data Book · Ramsar Sites and Waterbird Fauna · Genetic Diversity in Conservation · Extinction Approaches · IUCN Category: Least Concern reassessment risk · Conservation Genetics · Wildlife Conservation Strategies · Biodiversity Loss · Wildlife Conservation · Conservation Categories · Conservation Strategies · Endangered Species · Conservation Approaches · International Conventions · Species Recovery · Conservation Concepts · Protected Areas · Extinction · Population Decline · Threat Categories · Habitat Fragmentation · Biodiversity Patterns · Genetic Diversity · Conservation Projects · Extinction Vulnerability · Ex-situ Conservation · Biodiversity Hotspots · Threats to Biodiversity · Ramsar Sites · Conservation Ethics · IUCN Red List Categories · Protected Areas for Fauna · Endangered Species and Extinction · Poaching and Illegal Wildlife Trade · CITES and International Wildlife Trade · Wildlife Corridors · Project Tiger and Species-Specific Programmes · Animal Population Dynamics · Sacred Groves and Community Conservation · IUCN Categories - Data Deficient/Least Concern

8 free Biodiversity and Conservation practice questions with answers

Choose an answer in your head before opening it. Each explanation says why the correct option is right and, where relevant, why the tempting wrong option is wrong.

1. Question 1 · easy · Wildlife Conservation

   Project Tiger, launched in India in 1973, protects the tiger primarily by designating and managing dedicated tiger reserves with core (undisturbed) and buffer zones. Which statement best explains WHY protecting the tiger, specifically, is considered an effective broader conservation strategy?

   • A.The tiger is an apex predator and umbrella/flagship species, so conserving its extensive habitat requirement automatically protects numerous co-occurring species and the ecosystem processes they depend on
   • B.The tiger has no particular ecological significance beyond its own survival; protecting it benefits only the tiger population itself
   • C.The tiger is protected only because of its economic value in the international fur trade, with no ecological justification
   • D.Protecting a single apex predator species like the tiger has been shown to have no measurable effect on the survival of other species sharing its habitat
   Show answer and explanation

   Answer: A. The tiger is an apex predator and umbrella/flagship species, so conserving its extensive habitat requirement automatically protects numerous co-occurring species and the ecosystem processes they depend on

   As an apex predator requiring large, intact habitat, the tiger serves as an umbrella and flagship species — protecting it and its extensive territory indirectly conserves the many other species and ecological processes sharing that habitat.

   The tiger is both an apex predator (top of the food chain, indicating overall ecosystem health) and a flagship/umbrella species: because tigers require large tracts of relatively undisturbed habitat to maintain viable populations, conservation measures designed around protecting tiger habitat (like tiger reserves under Project Tiger) end up protecting the entire community of species — prey species, other predators, plants, and ecosystem processes — sharing that same landscape. This 'umbrella effect' makes single-species conservation efforts targeting a charismatic, wide-ranging apex predator an efficient broader conservation strategy. Option B wrongly denies any broader ecological significance. Option C incorrectly attributes conservation rationale to trade value rather than ecological justification. Option D wrongly denies the well-documented umbrella effect of large-habitat-requiring apex predator protection.

   Common mistake: Viewing single-species conservation programmes as benefiting only that one species, without recognising the broader umbrella/flagship effect.

   Key point: Protecting a wide-ranging apex predator (umbrella species) like the tiger indirectly conserves the broader ecosystem and co-occurring species sharing its habitat.

2. Question 2 · medium · Conservation Categories

   The IUCN Red List classifies species into threat categories of progressively increasing extinction risk. Arrange the following animal-relevant categories in order of INCREASING extinction risk: (i) Vulnerable (ii) Near Threatened (iii) Critically Endangered (iv) Endangered.

   • A.(iv) → (iii) → (ii) → (i)
   • B.(ii) → (i) → (iv) → (iii)
   • C.(iii) → (iv) → (i) → (ii)
   • D.(i) → (ii) → (iii) → (iv)
   Show answer and explanation

   Answer: B. (ii) → (i) → (iv) → (iii)

   In order of increasing extinction risk: Near Threatened -> Vulnerable -> Endangered -> Critically Endangered.

   The IUCN Red List threat categories, in order of increasing extinction risk, are: Near Threatened (close to qualifying for a threatened category but not yet meeting the criteria), Vulnerable (facing a high risk of extinction in the wild in the medium-term future), Endangered (facing a very high risk of extinction in the near future), and Critically Endangered (facing an extremely high risk of extinction in the immediate future, the highest risk category before Extinct in the Wild and Extinct). This graded sequence allows conservationists to prioritise resources toward species facing the most severe near-term risk. Options B, C and D all misorder this sequence.

   Common mistake: Confusing the relative severity ordering of Vulnerable, Endangered and Critically Endangered categories.

   Key point: IUCN threat categories in increasing risk order: Near Threatened < Vulnerable < Endangered < Critically Endangered.

3. Question 3 · medium · Conservation Strategies

   For the critically endangered gharial (a fish-eating crocodilian), conservationists have both protected remaining wild river populations within sanctuaries AND raised gharial hatchlings in captivity at breeding centres before releasing them back into rivers. Which comparison correctly distinguishes these two conservation approaches?

   • A.Sanctuary protection is ex-situ conservation because it involves human management; captive breeding is in-situ conservation because it occurs on the same continent as the species' range
   • B.Ex-situ conservation cannot be applied to reptiles like the gharial; captive breeding programmes are only used for birds and mammals
   • C.Protecting wild river populations within sanctuaries is in-situ conservation, occurring within the species' natural habitat; captive breeding and release is ex-situ conservation, occurring outside the natural habitat before eventual reintroduction
   • D.Both approaches are identical forms of in-situ conservation, since the gharials are eventually always found in a river in both cases
   Show answer and explanation

   Answer: C. Protecting wild river populations within sanctuaries is in-situ conservation, occurring within the species' natural habitat; captive breeding and release is ex-situ conservation, occurring outside the natural habitat before eventual reintroduction

   In-situ conservation protects species within their natural habitat (river sanctuaries); ex-situ conservation involves conserving/breeding species outside their natural habitat (captive breeding centres), often with eventual reintroduction to the wild.

   In-situ conservation protects species within their natural habitat, such as designating and managing river stretches as protected sanctuaries where wild gharial populations continue to live and breed under reduced human disturbance. Ex-situ conservation involves conserving species components outside their natural habitat — in this case, captive breeding centres where gharial eggs are incubated and hatchlings raised under controlled, protected conditions before being released back ('head-started') into rivers once they are large enough to have better survival odds. The defining distinction is the LOCATION of protection/breeding relative to the natural habitat, not the eventual outcome (both aim to restore/maintain wild river populations) or the degree of human management involved (rejecting B and C's flawed criteria). Ex-situ conservation is applied across many taxa, including reptiles, fish, birds and mammals, not restricted to any particular group (rejecting D).

   Common mistake: Assuming a conservation programme's classification depends on where the species ends up rather than where the actual protection/breeding activity takes place.

   Key point: In-situ conservation occurs within the natural habitat (protected areas/sanctuaries); ex-situ conservation occurs outside it (captive breeding, zoos, seed banks), often feeding back into in-situ populations via reintroduction.

4. Question 4 · easy · Endangered Species

   The lion-tailed macaque is found naturally only in the rainforests of the Western Ghats of India and nowhere else in the world. Which term correctly describes this species' distribution pattern?

   • A.Invasive, since it was introduced to the Western Ghats from elsewhere
   • B.Migratory, since restricted geographic ranges always indicate seasonal movement between two or more distant regions
   • C.Cosmopolitan, since it is a well-known primate species
   • D.Endemic, since it is naturally restricted to a single specific geographic region and found nowhere else
   Show answer and explanation

   Answer: D. Endemic, since it is naturally restricted to a single specific geographic region and found nowhere else

   A species found naturally only in one specific geographic region and nowhere else in the world is termed endemic — exactly the case for the lion-tailed macaque, restricted to the Western Ghats.

   Endemism refers to a species' natural restriction to a single, defined geographic region, occurring nowhere else in the world naturally. The lion-tailed macaque is a classic example of Western Ghats endemism, found only in fragmented rainforest patches there. Option A confuses being well-known (cosmopolitan implies widespread distribution) with actual range restriction — the two are unrelated. Option C incorrectly assumes a native, restricted-range species must have been introduced, confusing endemism (natural restriction) with invasiveness (introduction to a new range by human activity). Option D wrongly equates having a restricted range with migratory behaviour, which are entirely separate ecological concepts — an endemic species may or may not move seasonally, and a restricted range does not by itself indicate migration.

   Common mistake: Confusing endemism (natural range restriction) with rarity due to introduction, or assuming restricted range implies migratory behaviour.

   Key point: Endemic species are naturally restricted to a single specific geographic region — a status distinct from cosmopolitan (widespread), invasive (introduced) or migratory (seasonally mobile) species.

5. Question 5 · medium · International Conventions

   CITES (the Convention on International Trade in Endangered Species of Wild Fauna and Flora) restricts or bans international trade in products such as ivory (from elephants), rhino horn, and tiger bone/skin. Which statement best explains the ecological rationale behind such trade restrictions?

   • A.CITES bans apply only to live animal trade and have no relevance to trade in animal parts/products like ivory or horn
   • B.Unregulated international trade creates strong economic incentives for poaching, directly driving population declines in the targeted species; restricting trade removes much of this incentive and reduces poaching pressure
   • C.CITES restricts trade purely to protect domestic markets and has no connection to reducing poaching or protecting wild populations
   • D.Trade restrictions have no measurable effect on poaching rates, since poachers operate entirely outside any market influence
   Show answer and explanation

   Answer: B. Unregulated international trade creates strong economic incentives for poaching, directly driving population declines in the targeted species; restricting trade removes much of this incentive and reduces poaching pressure

   By restricting the international trade that creates strong economic demand for products like ivory and rhino horn, CITES reduces the financial incentive driving poaching, helping protect wild populations of the targeted species.

   Unregulated international trade in wildlife products generates substantial financial incentives for poaching, since high market demand (for ivory carvings, rhino horn in some traditional medicine markets, tiger bone products) drives up prices, making illegal hunting profitable even under high risk. CITES works by restricting or banning international trade in listed endangered species and their parts/derivatives, aiming to reduce this market-driven incentive and thereby lower poaching pressure on wild populations, alongside enabling international law-enforcement cooperation. Option B wrongly denies this ecological/conservation rationale. Option C incorrectly denies the well-documented link between market demand and poaching intensity. Option D wrongly restricts CITES's scope to live-animal trade only, when the convention explicitly covers trade in animal parts, derivatives and products as well.

   Common mistake: Assuming international conservation treaties like CITES have purely political or economic-protectionist motives, disconnected from actual poaching/population outcomes.

   Key point: CITES reduces poaching pressure by restricting the international trade that creates the economic incentive for illegally hunting endangered species for their parts/products.

6. Question 6 · medium · Conservation Concepts

   A student claims: 'A keystone species is simply defined as the most numerous or highest-biomass species in an ecosystem, since only the most abundant species could possibly have a major ecological impact.' Evaluate this claim using the standard definition of a keystone species.

   • A.The claim is incorrect only because keystone species must always be plants, never animals, so the abundance criterion is simply misapplied to the wrong kingdom
   • B.The claim is correct for terrestrial ecosystems but incorrect for aquatic ecosystems, since keystone species theory does not apply underwater
   • C.The claim is correct; abundance and ecological impact are always directly proportional in any ecosystem
   • D.The claim is incorrect: a keystone species is defined by its disproportionately large ecological effect relative to its abundance or biomass — it need not be the most numerous species, and is often relatively rare, exerting influence through its specific functional role (e.g. as a predator, pollinator, or ecosystem engineer)
   Show answer and explanation

   Answer: D. The claim is incorrect: a keystone species is defined by its disproportionately large ecological effect relative to its abundance or biomass — it need not be the most numerous species, and is often relatively rare, exerting influence through its specific functional role (e.g. as a predator, pollinator, or ecosystem engineer)

   A keystone species is defined by having a disproportionately large ecological effect relative to its abundance — it is often NOT the most numerous species, exerting outsized influence through its specific functional role rather than sheer numbers.

   The keystone species concept specifically emphasises DISPROPORTIONATE ecological influence — an effect on community structure and function that is far greater than would be predicted from the species' relative abundance or biomass. Classic examples (like the sea otter in kelp forest ecosystems, or the tiger in Indian forests) are often not the most numerous organisms present; their importance stems from a specific functional role — as a top predator controlling herbivore/prey populations, a keystone pollinator, or an ecosystem engineer — not from sheer numbers. The student's claim inverts this defining characteristic, equating impact with abundance. Options C and D introduce entirely unrelated, fabricated restrictions (kingdom, ecosystem type) rather than correctly addressing the actual abundance-versus-impact misconception in the claim.

   Common mistake: Equating a species' ecological importance directly with its numerical abundance or biomass, rather than its distinct functional role.

   Key point: Keystone species exert ecological influence disproportionate to their abundance/biomass — they are often relatively rare, not the most numerous species in their community.

7. Question 7 · easy · Extinction

   The dodo, a large flightless bird endemic to the island of Mauritius, went extinct within about a century of human arrival on the island, primarily due to hunting and the introduction of non-native predators (rats, pigs) that consumed dodo eggs. Which factor made the dodo especially vulnerable to extinction from these newly introduced threats?

   • A.Flightless birds are inherently unable to survive on any island regardless of predator presence, making extinction inevitable independent of human activity
   • B.As an island-endemic species with no evolutionary history of mammalian predators, the dodo had not evolved effective defensive behaviours or flight capability to escape newly introduced predators and human hunters
   • C.The dodo was already critically endangered before humans arrived on Mauritius, and human activity had no measurable additional effect on its decline
   • D.The dodo went extinct due to a naturally occurring disease outbreak entirely unrelated to human arrival or introduced species
   Show answer and explanation

   Answer: B. As an island-endemic species with no evolutionary history of mammalian predators, the dodo had not evolved effective defensive behaviours or flight capability to escape newly introduced predators and human hunters

   Having evolved in isolation on Mauritius without mammalian predators, the flightless dodo had no evolved defences against the human hunters and introduced predators (rats, pigs) that arrived with human settlement, making it especially vulnerable to rapid extinction.

   Island-endemic species that evolve in the absence of significant predators often lose or never develop defensive traits (like flight, wariness, or rapid reproduction) needed to cope with newly introduced threats, because such traits are costly to maintain without ongoing predation pressure selecting for them. The dodo, having evolved on isolated Mauritius without native mammalian predators, was flightless, ground-nesting, and behaviourally unwary — traits that were adaptive in its predator-free environment but became severe liabilities once humans arrived with hunting pressure and introduced rats and pigs that consumed dodo eggs and chicks. This combination of naivety and vulnerability, not any pre-existing decline (rejecting B) or disease (rejecting C), explains the dodo's rapid extinction. Option D overgeneralises, since many flightless island species persisted for very long periods before human-introduced threats appeared, showing flightlessness alone is not inherently fatal.

   Common mistake: Assuming a species' extinction must be due to some pre-existing weakness or unrelated natural cause, rather than a well-documented direct human/introduced-species impact.

   Key point: Island-endemic species without an evolutionary history of significant predators are especially vulnerable to extinction from newly introduced predators/hunting, since they lack evolved defensive traits.

8. Question 8 · medium · Population Decline

   A rhino population in a reserve stood at 400 individuals. Over five years, poaching removed an average of 20 individuals per year, while births and natural survival added an average of 12 individuals per year to the population. Assuming this trend continues unchanged, approximately what will the population size be at the end of the five-year period?

   • A.400 individuals
   • B.460 individuals
   • C.360 individuals
   • D.300 individuals
   Show answer and explanation

   Answer: C. 360 individuals

   Net annual change = 12 (births/survival) - 20 (poaching) = -8 individuals/year; over 5 years, total change = -40; final population = 400 - 40 = 360 individuals.

   Net annual change = births/survival added (12) minus poaching removed (20) = -8 individuals per year. Over five years, total net change = -8 x 5 = -40 individuals. Final population = 400 - 40 = 360 individuals. This demonstrates how even a moderate poaching rate exceeding the natural recruitment rate can drive a steady, compounding population decline over time. Option A incorrectly adds rather than nets the two rates. Option C considers only the poaching loss (20 x 5 = 100 removed, 400-100=300) without netting the recruitment gain. Option D wrongly assumes no net change despite the stated imbalance between poaching and recruitment.

   Common mistake: Adding rather than subtracting the loss rate from the gain rate, or ignoring one of the two rates entirely.

   Key point: Net population change = (births/survival gains) - (poaching/mortality losses) per year, compounded over the given time period.

Questions about Biodiversity and Conservation for NEET

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Questions are original NEET720 compositions reviewed for correctness, syllabus fit and option quality. Counts update as the bank grows (198 active practice questions in this chapter today).