CBSE 2022 · Region 3 · Set 1 · Q5 · 2 marks
Mammals are capable of maintaining homeostasis. But, very few smaller animals can survive in polar regions. Give reasons.
Marking-scheme solution
Heat loss or gain is a function of surface area, since small animals have large surface area compared to their volume, they tend to lose body heat very fast during severe winters, have to expend much energy to generate body heat through metabolism so they undergo hibernation or migration.
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CBSE Class 12 Biology past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.