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Question
What is wilting? Some plants show wilting of their leaves at noon even when the soil is well watered, Why is it so?
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Solution
Wilting refers to the loss of cellular turgidity in plants which results in the drooping of leaves or plant as a whole because of lack of water.
During noon the rate of transpiration exceeds the rate of absorption of water by roots. Due to the excessive transpiration, the cells of leaves lose their turgidity and wilt.
RELATED QUESTIONS
Give suitable explanation for the following:
More transpiration occurs from the lower surface of a dorsiventral leaf.
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 surface
(d) left uncoated.
All the four leaves A, B, C & 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?
Choose the correct answer from the four options given below :
Which one of the following does not affect the rate of transpiration ?
Answer the following (only in few words);
How does transpiration take place in night?
Choose the correct answer:
Rate of transpiration is more, when __________
Briefly explain how the rate of transpiration is affected by:
The humidity of the atmosphere.
Name the following:
Season in which the transpiration rate is the highest.
Give Technical Term
The substances which check the rate of transpiration.
