Question

In an experiment, four freshly plucked leaves (A - D) of a plant, such as those of China-Rose, were treated as follows :
(A) coated with Vaseline on its upper surface.
(B) coated on the lower surface
(C) coated on both surfaces
(D) left uncoated
All the four leaves A, B, C & D were left in a room for about $24$ hours.
Which leaf would become most limp? Why?

Answer 1

The leaf D become most limp. Because this is the only leaf which is left uncoated and water would be lost through transpiration from both the upper and lower surfaces.