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प्रश्न
What is cohesion?
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उत्तर
The force of attraction between the water molecules is called cohesion.
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संबंधित प्रश्न
The loss of water as water vapour from the acrial parts of a plant is known as
Give suitable explanation for the following:
Excessive transpiration results in the wilting of the leaves.
There is a general belief that forests tend to bring more frequent rains. Can you explain it scientifically?
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 :
IAA
Answer the following (only in few words);
How does transpiration take place in night?
Explain how the rate of transpiration is affected on:
a foggy day
Briefly explain how the rate of transpiration is affected by:
The intensity of light.
Describe any three conditions which affect transpiration.
Name the three external factors which increase the rate of transpiration.
