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WAEC Biology 2018 Question 13

Question 13

Homeostasis

An example of homeostasis in living organisms is

  1. A.cooling effect resulting from evaporation of water from the body surface.
  2. B.root hairs of a plant growing towards a source of light.
  3. C.changing of the body colour of chameleon to match the colour of the foliage on which it is resting.
  4. D.the release of phosphorus into the phloem of a plant growing in a phosphorus-deficient soil.
Show the answer and explanation

Answer: A (cooling effect resulting from evaporation of water from the body surface.)

Explanation

Sweating cools the body as the sweat evaporates, which keeps body temperature steady. Keeping internal conditions constant is homeostasis.