Question map
Consider the following : 1. Bats 2. Bears 3. Rodents The phenomenon of hibernation can be observed in which of the above kinds of animals?
Explanation
The phenomenon of hibernation can be observed in all three kinds of animals mentioned.
Bats generally do not feed during hibernation and rely on pre-hibernation fattening and subsequent use of these reserves to fuel hibernation[1], confirming that bats do hibernate. Bear hibernation is different than most hibernating animals -[2] when a bear 'hibernates' it is really in a deep sleep with body temperature drops but not drastically and it does not wake up[2], indicating that bears exhibit a form of hibernation (though technically called torpor or winter sleep). True hibernation (like we see in ground squirrels) involves a drastic drop in body temperature but the hibernating animal will awaken occasionally to eat and defecate before resuming hibernation[3], which confirms that rodents like ground squirrels are classic hibernators.
Therefore, hibernation can be observed in bats, bears, and rodents, making option C (1, 2 and 3) the correct answer.
Sources- [1] https://www.nature.com/articles/s41598-024-52459-9
- [2] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 11: Schedule Animals of WPA 1972 > Do you know? > p. 171
- [3] Environment, Shankar IAS Acedemy .(ed 10th) > Chapter 11: Schedule Animals of WPA 1972 > Do you know? > p. 171
PROVENANCE & STUDY PATTERN
Guest previewThis is a classic 'Science in Everyday Life' question. While standard texts (Shankar IAS) debate the technicality of 'true hibernation' vs. 'torpor' in bears, UPSC expects the broader functional definition. It rewards common sense about temperate climate survival over strict zoological taxonomy.
This question can be broken into the following sub-statements. Tap a statement sentence to jump into its detailed analysis.
- Explicitly describes pre-hibernation fattening and use of fat reserves to fuel hibernation.
- States bats generally do not feed during hibernation, indicating seasonal torpor behavior.
- Discusses torpor and energy expenditure specifically during hibernation.
- Refers to 'hibernating Indiana bats' and an optimal hibernation temperature, confirming hibernation as a behavior in bats.
- Refers to onset of hibernation and changes in body condition linked to overwinter survival.
- States 'the hibernating bats in our study area' indicating that these bats undergo hibernation.
Notes that fruit bats are important pollinators and seed dispersers, indicating that some bat species are active pollinators.
A student could combine this with the fact that many pollinators hibernate seasonally to ask whether pollinating bats (often tropical/fruit bats) follow the same seasonal dormancy patterns as other pollinators.
States a general pattern: 'pollinators come out of hibernation', establishing that hibernation is a known seasonal strategy among pollinating animals.
Use this rule plus knowing which bats act as pollinators to infer that some bat species might hibernate in climates with seasonal resource shortages.
Explains that mammals show different kinds of winter dormancy (true hibernation vs. lighter torpor/deep sleep), establishing that mammalian hibernation is variable.
Combine this pattern with the fact that bats are mammals to reason that if bats do enter dormancy, the form could vary by species and climate (torpor, true hibernation, or reduced activity).
Describes diel activity patterns in biomes, noting nocturnal animals and continuous activity in tropical rainforests.
A student could use this plus location data (tropical vs temperate ranges of bat species) to predict that tropical, continuously active ecosystems likely host non-hibernating bats, whereas temperate bats might hibernate.
Gives examples of seasonal hibernation behaviour in animals (snakes coming out of hibernation), illustrating that hibernation is a seasonal response among diverse taxa.
Extend this general seasonal-hibernation pattern to mammals and then ask whether bat species in seasonal climates exhibit analogous behaviour when resources decline.
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