Post-UTME Biology 2019 Objective — Question 4
Question 4 of 20 from the Post-UTME Screening (Post-UTME) Biology 2019 Objective paper, with the correct answer and a full explanation.
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When the environment is cold, the hairs of mammals stand on end to
- A. increase the surface area of the animal
- B. trap more air over the body surface and prevent heat lossCorrect
- C. expel heat from the body of the mammal
- D. completely absent from the illuminated side
Explanation
Erect hairs trap a layer of air close to the skin; since air is a poor conductor of heat, this insulating layer reduces heat loss.
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