Based
on the above activity, give the answers of the following questions.
(a)
Why transpiration is necessary for the plants?
(b)
What is transpiration pull?
Answer:
(a)
Transpiration is necessary because of the following reasons
(i)
It helps in the absorption and upward movement of water and minerals by creating
a transpiration pull.
(ii)
It helps in temperature regulation.
(iii)
It maintains a constant supply of ions to the leaves.
(iv)
It helps to remove excess water. 
(b)
Water vapour evaporates from the leaf creates a kind of suction (towards
upward) which is called transpiration pull. (1/2)
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