401. A wildlife sanctuary protects several animal species, but an endangered plant occurring just outside the sanctuary continues to decline because its habitat remains unprotected. What is the strongest lesson?
ⓐ. Protected areas automatically conserve every species in the surrounding region.
ⓑ. A sanctuary protects only animals and can never benefit plants.
ⓒ. Ex situ conservation always makes habitat boundaries irrelevant.
ⓓ. Effectiveness depends on protecting both the organism and its required habitat.
Correct Answer: Effectiveness depends on protecting both the organism and its required habitat.
Explanation: The existence of a protected area does not automatically protect every organism in the broader landscape. Conservation benefit depends on whether the species' habitat, population and ecological requirements are actually covered by the protection. The endangered plant lies outside the sanctuary and its habitat continues to deteriorate, so the sanctuary does not directly remove the pressure affecting that population. This illustrates a spatial limitation of in situ conservation planning. Protected areas can conserve many species simultaneously, but their boundaries and ecological coverage must match the distributions of the organisms they are intended to protect. For this biological comparison, species-specific backup measures can complement natural-habitat protection but do not replace the ecological context maintained by in situ conservation.
402. A sacred grove is surrounded by heavily modified land. Several rare plants remain inside the grove, but one plant requiring seasonal movement of an animal pollinator begins to decline after surrounding habitat becomes unsuitable for the pollinator. Which conclusion is most appropriate?
ⓐ. Sacred-grove protection has no conservation value.
ⓑ. The declining plant should automatically be classified as an alien species.
ⓒ. Key interactions may depend on landscape beyond the protected site.
ⓓ. The pollinator's movement proves that the grove is ex situ.
Correct Answer: Key interactions may depend on landscape beyond the protected site.
Explanation: The grove can function effectively as an in situ refuge for organisms whose ecological requirements are contained within it. The declining plant, however, depends on a pollinator whose seasonal movement extends beyond the grove. Degradation of the surrounding landscape disrupts an interaction required for reproduction even though the grove itself remains protected. This demonstrates that conservation boundaries may need to reflect ecological processes rather than only the physical location of individual organisms. Sacred groves remain valuable natural refuges, but some species can depend on connectivity or interactions operating at a larger spatial scale than the protected patch itself. Sacred groves are in situ conservation sites since community protection allows natural vegetation, rare species and ecological interactions to persist within the original habitat.
403. Which conservation facility most directly preserves a threatened woody plant as a complete living organism outside its natural habitat?
ⓐ. Cryogenic gamete store
ⓑ. Seed bank
ⓒ. Botanical garden
ⓓ. Wildlife corridor
Correct Answer: Botanical garden
Explanation: A botanical garden can maintain complete living plants under managed conditions outside their natural habitat, making it a conventional ex situ facility. A seed bank stores seeds rather than complete mature organisms, while cryogenic storage preserves selected reproductive material or other biological material at very low temperatures. A wildlife corridor functions within a natural or semi-natural landscape and is associated with in situ connectivity rather than off-site conservation. The question distinguishes conservation by the biological unit being maintained: whole plant, seed, gamete or habitat connection. Matching the conservation method to the target material is essential when choosing an appropriate strategy. The interpretation also requires recognising that seed banks, cryopreservation, tissue culture and managed living collections preserve different biological materials, so the method must match what can remain viable.
404. A threatened animal survives only in a wildlife safari park, while no self-sustaining population remains in nature. Which biological limitation of the conservation programme is most important?
ⓐ. The species has no remaining genetic material.
ⓑ. Species survives ex situ; wild ecological role absent.
ⓒ. Safari parks cannot maintain living animals.
ⓓ. The species has necessarily become endemic to the park.
Correct Answer: Species survives ex situ; wild ecological role absent.
Explanation: The safari park has prevented complete disappearance of living individuals, which is an important ex situ conservation achievement. However, survival under managed conditions does not restore the species' role in its original ecosystem. Interactions such as predation, competition, dispersal, grazing, pollination or other ecological functions cease in the wild when the natural population disappears. The population may still preserve genetic material and reproductive potential, but ecosystem-level conservation remains incomplete. The distinction demonstrates why ex situ survival and ecological restoration are different conservation outcomes, even when both are valuable. The same reasoning also shows that stored genetic material can provide insurance against population loss but cannot by itself preserve the ecological interactions and habitat required in the wild.
405. Gametes from a threatened species are cryopreserved. After thawing, \(90\%\) remain alive, but only \(5\%\) can successfully participate in fertilisation. Which conclusion is best supported?
ⓐ. Survival can overstate success when reproductive function is poorly retained.
ⓑ. Cryopreservation was completely successful because most cells remained alive.
ⓒ. Fertilisation ability is irrelevant in gamete conservation.
ⓓ. The species has been restored in situ.
Correct Answer: Survival can overstate success when reproductive function is poorly retained.
Explanation: Cryopreserved gametes are conserved for their potential contribution to future reproduction, so simple cellular survival is not the only relevant outcome. Although \(90\%\) remain alive after thawing, only \(5\%\) retain the capacity required for successful fertilisation. Functional fertility is therefore much poorer than survival percentage alone suggests. A conservation assessment should measure whether preserved gametes remain viable in the biologically meaningful sense needed for reproduction. The observation also has no direct connection with in situ restoration, since the material remains part of an off-site conservation programme until it contributes to living populations. Another useful inference is that tissue culture is especially useful when viable living plant tissue can be propagated, while cryopreservation is suited to long-term storage of appropriate reproductive material.
406. Cryopreserved gametes are used successfully to produce healthy offspring in a specialised breeding facility, but no animals are returned to the restored natural habitat. Which conservation objective remains unmet?
ⓐ. Preservation of viable reproductive material outside the natural habitat
ⓑ. Re-establishment of a self-sustaining population and ecological role in the wild
ⓒ. Demonstration that assisted reproduction can produce living offspring
ⓓ. Maintenance of living individuals under managed ex situ care
Correct Answer: Re-establishment of a self-sustaining population and ecological role in the wild
Explanation: Successful cryopreservation and assisted reproduction show that ex situ methods have preserved reproductive potential and produced living individuals. Those achievements are important, but they do not by themselves restore the species to its original ecosystem. A wild population must survive and reproduce within suitable habitat and resume the ecological relationships associated with natural persistence. Until that occurs, the species remains dependent on managed care and may still be absent from its former ecological role. Conservation can involve a sequence of complementary goals: safeguard reproductive material, produce viable offspring, restore or secure habitat and, where biologically appropriate, establish a self-sustaining in situ population. The question separates technical success in ex situ breeding from full ecological recovery in nature.
407. Tissue culture rapidly produces many plants from a single surviving individual of a threatened species, but the species formerly contained several genetically distinct populations. Which limitation remains most important?
ⓐ. Tissue culture necessarily converts the propagated plants into a new species.
ⓑ. Producing many plants automatically recreates every lost habitat and pollinator interaction.
ⓒ. Multiplying one donor genotype does not recover genetic variation that existed in other populations.
ⓓ. A large number of cultured plants guarantees that the species is no longer threatened in the wild.
Correct Answer: Multiplying one donor genotype does not recover genetic variation that existed in other populations.
Explanation: Tissue culture can be extremely useful when only a small amount of viable plant material remains, given that many living plants can be regenerated from that material under controlled conditions. Numerical multiplication, however, should not be confused with restoration of genetic diversity. If all cultured plants originate from one donor, they represent only the genetic information present in that individual or tissue line. Alleles and combinations that existed in other populations may remain absent even when thousands of plants are produced. A stronger ex situ programme would sample genetically distinct sources where possible and would combine propagation with protection or restoration of natural habitat. The method can rescue living material and increase plant numbers, but conservation quality also depends on genetic representation and eventual recovery of ecological function in the wild.
408. A seed bank stores \(40\) genetically distinct crop strains. Five years later, only \(30\) remain viable, and the \(10\) lost strains no longer exist in cultivation. What fraction of the originally stored strain diversity remains represented by viable seeds?
ⓐ. \(30\%\)
ⓑ. \(25\%\)
ⓒ. \(75\%\)
ⓓ. \(70\%\)
Correct Answer: \(75\%\)
Explanation: The fraction represented by viable stored strains is
\[
\frac{30}{40}\times100=75\%
\]
The remaining \(25\%\) of the originally stored strain set has been lost from the viable seed collection. Since those \(10\) strains also no longer exist in cultivation, their loss from the bank represents loss of the stored genetic representatives themselves rather than merely failure of one duplicate sample. Seed-bank conservation depends not only on initial collection but also on maintaining viability over time. A germplasm collection provides genetic insurance only while the stored material remains biologically capable of regeneration. In biological terms, ex situ conservation maintains organisms or biological material away from the original habitat and is most useful when urgent backup or managed propagation is needed. The evidence further indicates that seed banks, cryopreservation, tissue culture and managed living collections preserve different biological materials, so the method must match what can remain viable.
409. Assertion: Tissue culture and seed banking can both contribute to ex situ plant conservation.
Reason: Tissue culture and seed banking preserve exactly the same biological material and serve identical immediate purposes.
ⓐ. Both Assertion and Reason are true, and Reason correctly explains Assertion.
ⓑ. Both Assertion and Reason are true, but Reason does not explain Assertion.
ⓒ. Assertion is false, but Reason is true.
ⓓ. Assertion is true, but Reason is false.
Correct Answer: Assertion is true, but Reason is false.
Explanation: The Assertion is true as both methods operate outside the natural habitat and can support plant conservation. The Reason is false, since their biological targets and uses differ. Tissue culture maintains and propagates living plant tissue, often allowing rapid multiplication of individuals. Seed banks preserve seeds or germplasm representing genetic strains for later regeneration. These approaches may complement one another, but they should not be treated as interchangeable. Distinguishing what is stored and what conservation function is achieved is essential for selecting the most appropriate ex situ technique for a particular threatened plant or crop resource. This pattern follows from the fact that seed banks, cryopreservation, tissue culture and managed living collections preserve different biological materials, so the method must match what can remain viable. A closely related idea is that stored genetic material can provide insurance against population loss but cannot by itself preserve the ecological interactions and habitat required in the wild.
410. A migratory species breeds in Country P, feeds seasonally in Country Q and passes through Country R. Protection is strong in P but weak in Q. Population decline continues. Which inference best explains the failure?
ⓐ. Protection in the breeding country automatically guarantees conservation everywhere.
ⓑ. Transboundary habitat dependence means loss in Q can undermine protection in P.
ⓒ. Migration converts the species into an alien organism.
ⓓ. International cooperation is unnecessary when one country has a protected area.
Correct Answer: Transboundary habitat dependence means loss in Q can undermine protection in P.
Explanation: Migratory species often require several geographically separated habitats during different stages of their annual cycle. Protecting the breeding area alone cannot sustain the population if a major feeding, resting or seasonal habitat elsewhere is degraded. The biological unit needing conservation is effectively the whole migration system rather than a single political jurisdiction. This is one reason biodiversity conservation may require cooperation among countries. Political boundaries do not alter the ecological requirement for connected seasonal habitats, and failure at one essential location can reduce the effectiveness of otherwise strong protection elsewhere along the route.
411. Which pairing correctly distinguishes the main historical emphasis of the two international meetings?
ⓐ. Rio \(1992\): elimination of all biological-resource use; Johannesburg \(2002\): creation of seed banks only
ⓑ. Rio \(1992\): conservation plus sustainable use; Johannesburg \(2002\): reduce biodiversity-loss rate
ⓒ. Rio \(1992\): Red Data Book publication; Johannesburg \(2002\): discovery of biodiversity hotspots
ⓓ. Rio \(1992\): cryopreservation; Johannesburg \(2002\): tissue culture
Correct Answer: Rio \(1992\): conservation plus sustainable use; Johannesburg \(2002\): reduce biodiversity-loss rate
Explanation: The Rio Earth Summit of \(1992\) is associated with international recognition of biodiversity conservation together with sustainable use of its benefits. The Johannesburg World Summit on Sustainable Development in \(2002\) is associated with a multinational pledge to work toward a significant reduction in the rate of biodiversity loss by the historical target year \(2010\). The two meetings belong to the same broad international conservation movement but had different contextual emphases. Keeping their purposes distinct avoids reducing summit history to date memorisation and prevents interchange of the major conservation commitments associated with each event. This line of reasoning also establishes that sustainable utilisation permits biological-resource use only when that use does not undermine long-term persistence or ecosystem functioning.
412. Arrange the following ideas into the most biologically coherent sequence for international conservation of a migratory threatened species:
I. Recognise that essential habitats occur in several countries.
II. Coordinate conservation commitments across the countries.
III. Protect the different habitats required across the migration cycle.
IV. Improve survival across the full ecological range.
ⓐ. II -> I -> IV -> III
ⓑ. III -> IV -> I -> II
ⓒ. I -> II -> III -> IV
ⓓ. IV -> III -> II -> I
Correct Answer: I -> II -> III -> IV
Explanation: Conservation begins by recognising the biological problem: the species depends on several habitats distributed across political boundaries. That recognition creates the need for international coordination. Coordinated commitments can then support protection of the breeding, feeding, resting or migratory habitats used during the annual cycle. If those essential components are effectively maintained, survival can improve across the species' full ecological range. The sequence is causal rather than merely chronological. International cooperation is valuable precisely as no single country controls every habitat required by the migratory population, so coordinated protection addresses a biological system that extends beyond national borders. The process can be understood by noting that vulnerability is uneven across taxa, so the threatened proportion observed in one group should not be assumed to apply to all other groups.
413. A Red Data Book record identifies a plant as endangered, while another database simply confirms that the plant has been observed in three districts. What additional biological information is supplied by the first record?
ⓐ. The complete ecological role of the species
ⓑ. Proof that the plant has already become extinct
ⓒ. Exact genetic diversity within every population
ⓓ. Elevated conservation concern from extinction risk
Correct Answer: Elevated conservation concern from extinction risk
Explanation: A presence database answers a distributional question: it shows that the plant has been recorded in particular places. A Red Data Book record adds a different dimension by indicating conservation concern related to extinction risk. It does not imply that extinction has already occurred, because endangered or threatened organisms are still living. Nor does the status alone provide a complete measure of genetic variation or ecological function.
414. A species is maintained successfully in captivity for many generations, but its natural habitat disappears completely. Which conservation objective remains unmet?
ⓐ. Preservation of any living individual
ⓑ. Maintenance of genetic material under managed conditions
ⓒ. Species functioning within its original ecosystem
ⓓ. Ex situ survival
Correct Answer: Species functioning within its original ecosystem
Explanation: Captive maintenance can preserve living individuals, allow reproduction and retain at least part of the species' genetic diversity. Those are important ex situ achievements. However, complete loss of the natural habitat prevents the species from functioning within the original ecosystem. Natural interactions with prey, predators, competitors, mutualists and environmental conditions are absent. The programme has therefore preserved the organism but not the ecological context in which it evolved and functioned. This distinction explains why ex situ conservation is often best viewed as a complement to habitat protection rather than a complete substitute for successful in situ conservation. This distinction is reinforced by the fact that in situ conservation protects organisms within their natural habitat, allowing population processes and ecological interactions to continue in the original ecosystem. Following the same logic, protected landscapes can conserve habitat structure, food webs, pollination, dispersal and natural genetic variation rather than only keeping isolated individuals alive.
415. A threatened plant occupies a habitat that is currently safe, but its population has only four reproductive individuals and continues to decline due to an unresolved biological problem. Which strategy is most defensible?
ⓐ. Maintain habitat protection and add ex situ backup against immediate loss.
ⓑ. Destroy the habitat and rely entirely on stored seeds.
ⓒ. Introduce an unrelated alien species to increase local richness.
ⓓ. Ignore population size because habitat protection alone guarantees survival.
Correct Answer: Maintain habitat protection and add ex situ backup against immediate loss.
Explanation: The habitat remains suitable, so abandoning in situ protection would remove an important conservation asset. At the same time, only four reproductive individuals remain, creating a severe immediate risk that the population could disappear before the underlying problem is solved. An ex situ backup can preserve living material, tissues, seeds or other appropriate biological resources while the natural population continues to receive protection. The two approaches address different dimensions of risk: habitat protection maintains ecological context, while off-site conservation reduces the chance that one small population failure will eliminate all recoverable biological material. For the biological relationship involved, seed banks, cryopreservation, tissue culture and managed living collections preserve different biological materials, so the method must match what can remain viable.
416. A forest is fragmented, an endemic mammal declines, and the mammal's obligate parasite also begins disappearing. Which intervention most directly targets the earliest causal step?
ⓐ. Restore connectivity and protect remaining forest.
ⓑ. Preserve only the parasite in isolation.
ⓒ. Introduce an alien host species for the parasite.
ⓓ. Increase mammal harvesting to reduce competition.
Correct Answer: Restore connectivity and protect remaining forest.
Explanation: The causal sequence begins with fragmentation of the mammal's habitat. The mammal declines as connected habitat is lost, and the parasite subsequently faces co-extinction risk because it depends on that host. Restoring connectivity and protecting the remaining forest directly address the initiating mechanism rather than only the secondary consequence. Safeguarding the host also indirectly benefits the parasite by preserving the biological association it requires. Conservation is often most effective when intervention is directed at the earliest modifiable cause in a chain rather than treating only downstream symptoms after the primary ecological pressure remains active. The underlying process is clearer once we note that obligate mutualisms create reciprocal vulnerability because disappearance of one partner can eliminate the other partner's essential reproductive or resource pathway.
417. Four conservation programmes preserve different components of biodiversity.
| Programme | What is preserved |
|---|
| P | An intact mangrove ecosystem |
| Q | Seeds from many genetic strains of one crop |
| R | One captive population of a threatened animal |
| S | Several natural populations and the habitats connecting them |
Which programme most directly preserves ecological diversity together with natural species interactions?
ⓐ. Q
ⓑ. R
ⓒ. Q and R equally
ⓓ. P
Correct Answer: P
Explanation: Programme P protects an intact mangrove ecosystem within its natural setting, so it directly conserves ecological diversity together with many species and their interactions. Programme Q mainly preserves genetic diversity within a crop species, while Programme R maintains a population outside its natural habitat. Programme S supports natural connectivity, but P most directly represents protection of an entire ecosystem type in situ.
418. A region contains an endemic plant with high genetic variation, a specialised pollinator and a unique wetland ecosystem. Habitat conversion threatens all three. Which conservation action provides the broadest immediate biological protection?
ⓐ. Record the species names without changing land use.
ⓑ. Store seeds from one plant individual and allow the wetland to be converted.
ⓒ. Protect only the pollinator outside the wetland.
ⓓ. Protect the wetland in situ, with ex situ plant backup if needed.
Correct Answer: Protect the wetland in situ, with ex situ plant backup if needed.
Explanation: The threat operates at several nested biodiversity levels. Habitat conversion endangers the wetland ecosystem itself, the endemic plant and pollinator species, their interaction, and the genetic variation present within the plant population. Protecting the wetland in situ addresses the broadest set of biological components simultaneously. An ex situ backup can add insurance for the plant if its population remains exceptionally vulnerable, but it cannot replace preservation of the ecosystem or pollination relationship. The strongest plan combines ecosystem-level protection with targeted supplementary conservation rather than reducing a multi-level biodiversity problem to storage of a single organism or sample. The same conclusion depends on recognising that managed ex situ populations can support survival and later recovery, but long-term conservation still depends on suitable natural habitat whenever reintroduction is a goal.
419. A conservation fund can fully protect only one region.
| Region | Species richness | Endemic species | Habitat loss | Protection cost |
|---|
| P | Very high | Few | Low | High |
| Q | High | Many | Severe | Moderate |
| R | Moderate | Few | Severe | Low |
| S | Very high | Many | Low | Very high |
Which choice best reflects biodiversity hotspot prioritisation under limited resources?
ⓐ. Region Q, where richness, endemism and threat coincide at feasible cost.
ⓑ. Region P, since richness alone should dominate every conservation decision.
ⓒ. Region R, since low protection cost should outweigh biological uniqueness.
ⓓ. Region S, since low immediate threat makes protection most urgent.
Correct Answer: Region Q, where richness, endemism and threat coincide at feasible cost.
Explanation: Biodiversity hotspot prioritisation seeks a strong combination of biological richness, geographical irreplaceability and immediate threat. Region Q contains many species, many endemic species and severe habitat loss, so delay could result in irreversible global loss of restricted organisms. Its moderate protection cost also makes intervention feasible under a limited budget. Region P is rich but relatively secure and contains few endemic species. Region R is threatened but has lower biological uniqueness, while Region S is exceptionally rich and endemic but faces less immediate habitat loss. The decision therefore integrates biological value, urgency and resource limitation rather than relying on species number or cost alone.
420. A region originally qualified strongly for biodiversity hotspot conservation because of high richness, high endemism and rapid habitat destruction. Twenty years of successful protection greatly reduce habitat loss, while richness and endemism remain high. What has changed most directly?
ⓐ. Endemism has disappeared.
ⓑ. Threat is lower; irreplaceability remains high.
ⓒ. The region has become an ex situ facility.
ⓓ. Species richness has necessarily fallen.
Correct Answer: Threat is lower; irreplaceability remains high.
Explanation: Species richness and endemism describe biological characteristics of the region, whereas habitat loss measures the intensity of current threat. Successful protection can reduce the threat without removing the region's unusual biodiversity or the restricted distributions of its endemic species. The region may still deserve strong conservation attention, but the urgency arising from continuing habitat destruction has been reduced. Biological uniqueness and current threat can therefore change independently.
