Question

why transpiration is necessary for plants

Answer 1

Transpiration is important because:
(a) It helps in absorption and upward movement of water and minerals from roots ot leaves.
(b) it prevents the plant parts from heating up.

Answer 2

It is necessary -
1)by it plant can reduce extra water
2)It also make a force (made by the vacancy of water)  which help to suck water, minerals from soil.
3)It is also helpfull to environment because it help to rain.