Assertion: Small sized animals are rarely found in polar regions. Reason: Small sized animals have larger surface area relative to their volume and they have to spend much energy to generate body heat through metabolism.

Question

Assertion: Small sized animals are rarely found in polar regions. Reason: Small sized animals have larger surface area relative to their volume and they have to spend much energy to generate body heat through metabolism. (A) If both assertion and reason are true and reason is the correct explanation of assertion (B) If both assertion and reason are true but reason is not the correct explanation of assertion (C) If assertion is true but reason is false (D) If both assertion and reason are false

Tardigrade Admin · Accepted Answer

Thermoregulation is an energetically expensive process for many organisms. Heat loss or heat gain is a function of surface area. Small sized animals (such as shrews, humming birds etc.), have a larger surface area relative to their volume, they tend to lose body heat very fast when it is cold outside; thus they have to expend much energy to generate body heat through metabolism. This is the main reason why very small animals are rarely found in polar regions.

Q. Assertion : Small sized animals are rarely found in polar regions. Reason : Small sized animals have larger surface area relative to their volume and they have to spend much energy to generate body heat through metabolism.

If both assertion and reason are true and reason is the correct explanation of assertion

If both assertion and reason are true but reason is not the correct explanation of assertion

If assertion is true but reason is false

If both assertion and reason are false

Q. Assertion : Small sized animals are rarely found in polar regions.
Reason : Small sized animals have larger surface area relative to their volume and they have to spend much energy to generate body heat through metabolism.