You remove four fresh tobacco leaves of similar size and age. Leave "leaf 1" as it is, smear "leaf 2" with vaseline on the upper surface, "leaf 3" on the lower surface and "leaf 4" on both the surfaces. Hang the leaves for a few hours and you observe that leaf 1 wilts the most, leaf 2 has wilted, leaf 3 wilted less than leaf 2 and leaf 4 remains fresh. Which of the following conclusion is most logical?

Tobacco leaf has more stomata on the upper surface

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Tobacco leaf has more stomata on the lower surface

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Stomata are equally distributed in upper and lower surfaces

No worries! We‘ve got your back. Try BYJU‘S free classes today!

No conclusion on stomatal distribution can be drawn from this experiment

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C Tobacco leaf has more stomata on the upper surface
Transpiration is the loss of water in the form of water vapor from the parts of the plant. This takes with the help of stomata that are mostly present on the lower surface of leaves.
Leaf 1 is left as it is so it will undergo wilting.
Leaf 2 is smeared with vaseline on the upper surface and leaf 3 is smeared with vaseline on the lower surface. Hence leaf 2 will wilt more due to the presence of more stomata on the lower surface.
Leaf 4 will remain fresh due to the stomatal covering on both surfaces.
Thus, the correct answer is option B.

Suggest Corrections

Similar questions

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.

(D) left uncoated.

All the four leaves A, B, C and D were left in a room for about 24 hours.

(i) Which leaf would become most limp ? Why ?

(ii) Which leaf would show least limping ? Why ?

Join BYJU'S Learning Program