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JAMB Biology 1989 Question 42

Question 42

Adaptation

A physiological adaptation of plants to the problem of excessive water loss is

  1. A.reducton in the number of stomata
  2. B.reversal of the normal stomatal rhythm
  3. C.possession of shallow roots
  4. D.possession of waxy cuticle
Show the answer and explanation

Answer: B (reversal of the normal stomatal rhythm)

Explanation

Opening stomata at night and closing them by day is a change in how the plant works (physiological); fewer stomata and waxy cuticle are structural.