Question map
Consider the following statements : Statement-I : Marsupials are not naturally found in India. Statement-II : Marsupials can thrive only in montane grasslands with no predators. Which one of the following is correct in respect of the above statements?
Explanation
The correct answer is Option 3: Statement-I is correct but Statement-II is incorrect.
Statement-I is correct: Marsupials (mammals that carry young in pouches, such as kangaroos and koalas) are not native to India. They are geographically restricted primarily to Australasia and the Americas. Indiaβs mammalian fauna consists almost entirely of placental mammals.
Statement-II is incorrect: The claim that marsupials can thrive only in montane grasslands with no predators is factually wrong. Marsupials are highly adaptable and inhabit diverse ecosystems, including tropical rainforests, deserts, and temperate forests. Furthermore, they coexist with various natural predators (like the Dingo or Tasmanian Devil). Their evolutionary success in Australia was due to long-term geographic isolation rather than a total absence of predators or a restriction to specific montane habitats.
Since the first statement is a factual geographical truth and the second is a restrictive biological fallacy, Option 3 is the only valid choice.
PROVENANCE & STUDY PATTERN
Full viewStatement I is basic static knowledge covered in standard texts (Shankar/Majid) regarding Zoogeographical realms. Statement II is a 'logic trap' using extreme qualifiers ('only', 'no predators'). You didn't need the specific research paper; you needed common sense and basic biogeography.
This question can be broken into the following sub-statements. Tap a statement sentence to jump into its detailed analysis.
- Statement 1: Are there any marsupial species native to India (i.e., naturally occurring without human introduction)?
- Statement 2: Are marsupials restricted to montane grasslands as their only habitat?
- Statement 3: Do marsupials require the absence of predators in their environment in order to thrive?
- Labels 'List of Marsupials (pouched mammals of Australia)', explicitly linking marsupials to Australia rather than India.
- Enumerates typical Australasian marsupials (kangaroo, koala, wallaby, etc.), none described as Indian natives.
- Defines marsupials as pouched mammals with examples (wallaby, kangaroo) that are conventionally Australasian.
- Provides characteristic biology of marsupials but contains no reference to Indian native marsupials, reinforcing their typical non-Indian distribution.
- States that American marsupials occupy multiple dietary niches (insectivorous, frugivorous, carnivorous), implying ecological diversity rather than confinement to a single habitat type.
- Mentions dominance of opossums in the Americas, indicating presence in varied ecosystems across that continent.
- Highlights high morphological diversity in Australasian marsupials, which implies occupation of diverse ecological roles and habitats.
- Contrasts Australasian diversity with American marsupials, indicating broad geographic and ecological distribution rather than restriction to montane grasslands.
Says marsupials evolved when tropical ecology was restricted to the equator, linking their origin to tropical environments rather than only montane grasslands.
A student could combine this with a world map to note tropical regions (e.g., equatorial zones) and check whether marsupial diversity occurs there today.
States the Neotropical faunal region (South America) contains 32 families of marsupials and emphasises great diversity in ecosystems and habitats.
Use a map of South America and habitat maps to infer marsupials occupy multiple habitat types (forest, savanna, etc.) in that region, not only montane grasslands.
Describes montane/alpine grasslands and associated high-altitude fauna (lists species), showing montane grasslands are a specific habitat type with particular species assemblages.
Compare the species listed for montane grasslands with known marsupial species lists to see if marsupials are typical inhabitants of these high-altitude grasslands.
Explains temperate grasslands occur across continents (Prairies, Steppe, Pampas, Veld, Downs in Australia), indicating grasslands are widespread and variable in climate and location.
A student could check the Australian 'Downs' and other regional habitats to see whether marsupials there occupy grasslands or other habitat types (forests, deserts, etc.).
- States marsupials in the Americas evolved in the presence of multiple other mammal lineages, showing they have persisted alongside other taxa rather than requiring predator-free environments.
- Notes these coexisting lineages affected niche use (e.g., grazing) but did not imply marsupials could not survive where other mammals were present.
- Documents extensive extant marsupial diversity across many species and families, implying marsupials thrive in a range of ecological contexts.
- Broad morphological and ontogenetic lability suggests marsupials can adapt to varied environments where predators or competitors may be present.
Gives a general rule that species introduced into areas with few or no natural predators can increase unchecked (alien invasive species thrive where predators are absent).
A student could apply this rule to ask whether marsupials introduced to predator-poor habitats show population booms, contrasting with native ranges where predators exist.
Describes the Neotropical region hosting 32 families of marsupials within a diverse fauna, implying marsupials coexist with many other vertebrates and predators in at least some regions.
A student could compare marsupial abundance and survival in such predator-rich regions versus predator-poor islands or introduced ranges using basic biogeographic data.
Notes Australian savannah is dominated by marsupials while other savannahs are characterized by large mammal grazers and predators β indicating marsupials can be dominant in ecosystems that may differ in predator communities.
A student could examine predator community composition in Australian savannahs (vs. African savannahs) to infer whether lower predator pressure correlates with marsupial dominance.
Explains marsupial life-history traits (early birth, altricial young that continue development in pouch) which could affect vulnerability to predators and influence how predation impacts population dynamics.
A student could use this trait plus basic ecology to hypothesize whether marsupials need predator refuges (e.g., dense vegetation) to protect dependent young, then seek empirical studies or distribution patterns.
Lists increased predators/competitors as factors contributing to species extinction and identifies vulnerability traits (ecological specialization, poor dispersal) that could make some species more affected by predators.
A student could evaluate whether marsupial species with those vulnerability traits have declined more where predator numbers rose, versus more generalist marsupials.
- [THE VERDICT]: Sitter disguised as a Bouncer. Statement I is standard Biogeography (Shankar IAS Ch 12); Statement II is eliminated by logic.
- [THE CONCEPTUAL TRIGGER]: Zoogeographical Realms & The Wallace Line (The boundary separating Oriental fauna of Asia from Australasian fauna).
- [THE HORIZONTAL EXPANSION]: 1. Wallace Line vs Weber's Line (Asian vs Australian fauna boundary). 2. Monotremes (Platypus/Echidna) - restricted to Australasia. 3. Shola Forests (Indian montane grasslands) - home to Nilgiri Tahr, not Marsupials. 4. Opossums - marsupials found in the Americas (proving they aren't restricted to montane grasslands). 5. Placental Mammals - the dominant mammal type in India.
- [THE STRATEGIC METACOGNITION]: Do not chase obscure animal facts. Focus on 'Exclusion Principles': Why are Tigers here and Kangaroos there? (Plate tectonics/Continental Drift). If a statement demands an 'absolute absence' of predators for a whole group to survive, it is ecologically suspect.
Marsupials are pouched mammals primarily associated with Australasia, so they are unlikely to be native to India.
High-yield for biogeography questions: knowing typical continental distributions (Australasia vs India) helps eliminate wrong options on species-origin and faunal affinity items; connects to evolution, dispersal and conservation status discussions.
- Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 4: BIODIVERSITY > x) not evaluated (ne) > p. 16
- Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 12: Animal Diversity of India > L?..3,2, Marsupials > p. 190
Determining whether a species is 'native' requires understanding endemic/indigenous versus introduced/exotic status.
Central to biodiversity and conservation topics in UPSC: helps answer questions on species protection, invasive species, and habitat management; links to hotspot/endemic-focused policy and exam questions on conservation priorities.
- CONTEMPORARY INDIA-I ,Geography, Class IX . NCERT(Revised ed 2025) > Chapter 5: Natural Vegetation and Wildlife > NATURAL VEGETATION AND WILDLIFE > p. 39
India's fauna comprises elements from African, European and Southeast Asian systems, not primarily Australasian groups like marsupials.
Useful for regional biodiversity and biogeography questions β explains why certain taxonomic groups occur or do not occur in India; connects to plate tectonics, historical biogeography and conservation planning.
- Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 4: BIODIVERSITY > IndIA β A MegA-BIodIversIty nAtIon. > p. 22
- Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 4: BIODIVERSITY > x) not evaluated (ne) > p. 16
Marsupials occur in multiple regions (for example South America and Australia) and comprise many families that occupy diverse habitats rather than a single habitat type.
High-yield for biogeography and biodiversity questions: explains taxon-level distribution patterns, helps distinguish endemic vs. widespread groups, and supports answers about evolutionary history and habitat diversity in ecosystems-based questions.
- Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 2: PLANT AND ANIMAL KINGDOMS > 6. neotropical region > p. 13
- Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 12: Animal Diversity of India > L?..3,2, Marsupials > p. 190
- Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 3: Geological Time Scale The Evolution of The Earths Surface > Late Cretaceous (100 mya to 65 mya) > p. 48
Grasslands exist in many forms (prairies, steppes, pampas, veld, downs) across continents and climates, so 'grassland' is not a single, uniform habitat.
Essential for questions on biomes, land use and species-habitat relations; linking grassland types to regional climate and human use helps answer distribution and conservation questions in UPSC mains and prelims.
- Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 3: MAJOR BIOMES > 8. Temperate Grasslands Biome > p. 13
- Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 20: The Temperate Continental (Steppe) Climate > Distribution > p. 189
- Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 30: Climatic Regions > Distribution > p. 445
Presence or absence of predators strongly alters whether a species' population can expand or be kept in check.
High-yield for ecology and conservation questions because predator-prey balance explains invasive species outbreaks and population collapses; links to trophic cascades and management policies. Mastery helps answer questions on invasive-species impacts, ecosystem stability, and wildlife management.
- Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 13: Plant Diversity of India > 13.4. INVASIVE ALIEN SPECIES > p. 199
- Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 13: Our Home: Earth, a Unique Life Sustaining Planet > 13.6 What Are the Threats to Life on Earth? > p. 223
Predation pressure, competition, disease and habitat change are explicit drivers that can lead species toward extinction or decline.
Core for biodiversity and conservation segments of the syllabus; explains vulnerability factors and extinction types asked in UPSC (natural, mass, anthropogenic). Connects to habitat fragmentation, trophic status and conservation planning questions.
- Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 12: Animal Diversity of India > I2.8. SPECIES EXTINCTION > p. 194
- Environment and Ecology, Majid Hussain (Access publishing 3rd ed.) > Chapter 4: BIODIVERSITY > types of extinction > p. 10
Monotremes (Egg-laying mammals like Platypus and Echidna). Since UPSC asked about Marsupials (Pouched mammals), the next logical evolutionary group is Monotremes, which are also restricted to the Australasian realm.
The 'Ecological Impossibility' Hack: Statement II claims they thrive 'only' with 'no predators'. In nature, prey species evolve *with* predators. An entire order of animals (Marsupialia) requiring a predator-free world to survive is an ecological absurdity. 'No predators' is an absolute that is 99% false in Biology.
Biosecurity & Trade (GS3): The natural absence of Marsupials in India is due to geological isolation. However, modern trade risks introducing 'Invasive Alien Species' (like the Red-eared Slider turtle), which is a major threat to Indian biodiversity and agriculture.