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Photosynthesis

What may happ...

Question

What may happen if the lower surface of a green leaf is coated with a thin layer of Vaseline?

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Solution

If vaseline is applied on the lower surface, the rate of transpiration and rate of photosynthesis will decrease as layer of vaseline blocks the stomata.

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Q. Leaves of a healthy potted plant were coated with vaseline for long time. What will happen?

Q. 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 show least limping? Why?

Q. 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?

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 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 ?

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