WAEC - Biology (2002 - No. 9)

Study the information below. Use it to answer question 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 ll. 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