IB Biology HL D3.3 Homeostasis questions

Exam-style multiple choice and written questions with full markschemes. Check multiple choice answers straight away, or type, photograph or draw a written answer and get it marked.

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Question 1

Multiple choiceEasy1 mark

After a person’s body temperature rises in a warm room, which response provides water at the skin surface for evaporative cooling?

Show answer and explanation

Answer: A. Sweat released onto the skin can evaporate, removing heat from the body and helping lower its temperature.

B: Vasodilation increases heat transfer to the skin but does not provide the water for evaporation.
C: Shivering contractions generate heat rather than directly increasing evaporative heat loss.
D: Hair erection helps retain an insulating layer of air, reducing heat loss.

Remember: sweating promotes evaporative cooling, whereas vasodilation promotes heat transfer to the skin.

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