Question 9
Transport in PlantsStudy the information below. In an experiment to study the rate of water loss in plants, leaves of a potted plant were treated as follows:
I. Upper surface covered with vaseline
II. Lower surface covered with vaseline
III. Both surfaces covered with vaseline
IV. None of the leaf surfaces covered
Indicate in a descending order, the rate of water loss from the leaves
- A.I, II, III and IV
- B.II, I, III and IV
- C.III, II, I and IV
- D.IV, I, II and III.
Show the answer and explanation
Answer: D (IV, I, II and III.)
Explanation
Most stomata are on the lower surface. Uncovered leaves (IV) lose most water, then leaves with only the upper surface covered (I), then those with the lower surface covered (II), and leaves covered on both sides (III) lose least.