Question 64 from UPSC CSE 2014 - Science and Technology

Question

Consider the following:
1. Bats
2. Bears
3. Rodents
The phenomenon of hibernation can be observed in which of the above kinds of animals?

IASCODEX · Accepted Answer

Correct Option: C. 1, 2, and 3

Strategy: Identify species from the list that are commonly recognized as hibernators. Evaluate bats, bears, and rodents against standard references, accepting torpor as a form of hibernation for bears. Select the option that includes all valid examples.

Key Info: Hibernation is a physiological state characterized by greatly reduced metabolic activity, body temperature, and heart rate, enabling animals to survive periods of food scarcity and lower temperatures. Examples:

- **Bats:** Most temperate-zone bats hibernate, often seeking caves or hollow trees for months, relying on stored fat.
- **Bears:** Bears enter a long, dormant state in winter known as torpor or denning, marked by lowered metabolism. Though technically different from 'true hibernation,' this state suffices for popular and many scientific classifications of hibernation, especially in brown, black, and grizzly bears.
- **Rodents:** This group contains many true hibernators, including ground squirrels, marmots, hamsters, and dormice. These animals markedly reduce their body temperature and metabolic rate, truly entering hibernation.

Other hibernators include some species of hedgehogs, lemurs, and amphibians. Hibernation mainly occurs in mammals but can also be seen in some cold-blooded animals (as 'brumation').

IASCODEX · Answer

Option A: 1 and 2 only

IASCODEX · Answer

Option B: 2 only

IASCODEX · Answer

Option D: Hibernation cannot be observed in any of the above

Consider the following: Bats Bears Rodents The phenomenon of hibernation can be observed in which of the above kinds of animals?

Consider the following:

Bats

Bears

Rodents
The phenomenon of hibernation can be observed in which of the above kinds of animals?