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प्रश्न
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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उत्तर
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.
संबंधित प्रश्न
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?
Expand the following biological abbreviations :
(i) ABA
Expand the following biological abbreviations :
IAA
Given below is an apparatus which has setup to investigate a physiological process in plants. The setup was placed in bright sunlight. Answer the questions that follow:
Name the process being studies. Define the process.
Answer the following (only in few words);
What is the relationship between transpiration water and water absorbed from the soil?
Choose the correct answer:
Rate of transpiration is more, when __________
Choose the correct answer:
Transpiration rate is high, when ___________
Briefly explain how the rate of transpiration is affected by:
The intensity of light.
Briefly explain how the rate of transpiration is affected by:
The humidity of the atmosphere.
