WAEC Biology 2018 Objective — Question 13

Question 13 of 50 from the West African Examinations Council (WAEC) Biology 2018 Objective paper, with the correct answer and a full explanation.

An example of homeostasis in living organisms is

A. cooling effect resulting from evaporation of water from the body surface
B. root hairs of a plant growing towards source of light
C. changing of the body colour of chameleon to match colour of foliage
D. release of phosphorus into the phloem of a plant growing in a phosphorus-deficient soilCorrect

Explanation

Homeostasis is the maintenance of a fairly constant internal environment; releasing/redistributing phosphorus to maintain internal balance under deficiency is a homeostatic response.

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