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Shrews and Hummingbirds are unable to regulate their body temperature because

Option: 1

Thermoregulation is an energy-intensive process.

Option: 2

Increased surface area-to-volume ratio

Option: 3

Both a and b are correct.

Option: 4

Thermoregulation is not an energy-dependent process.

Answers (1)



Shrews and hummingbirds are "conformers" when it comes to body temperature regulation. Unlike "regulators," which keep their internal body temperature generally constant, these animals allow their body temperature to fluctuate in response to changes in the external environment.

Shrews are small mammals with a fast metabolic rate and no significant insulating body coverings like fur or feathers. As a result, they are extremely sensitive to temperature changes in the environment and are unable to maintain a steady body temperature. Shrews are known as "endothermic conformers" because they create heat internally via metabolism but do not actively adjust their body temperature.

Hummingbirds, on the other hand, are little birds with fast wing movements and a high metabolic rate. They generate a substantial amount of metabolic heat due to their small size and high energy demand. Hummingbirds, on the other hand, have a high surface area-to-volume ratio, making them susceptible to heat loss or gain from their surroundings. They rely on external sources of heat, such as sunlight or shade, to some extent to control their body temperature, although not to the same extent as larger birds.

As a result, both shrews and hummingbirds are unable to control their body temperature as successfully as other creatures and are classified as thermoregulators.

Hence, option 3 is the correct answer.


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