Transpiration is necessary evil. Explain?

Explanation

A. Beneficial and harmful effects of transpiration are be Beneficial effects of transpiration :
1) It creates transpiration pull for absorption and transportation in plants.
(2) It supplies water for photosynthesis.
3) It transports minerals from the soil to all parts of the plant.
4) It cools leaf surfaces, sometimes 10 to 15 degrees, by evaporative cooling.
5) It maintains the shape and structure of the plants by keeping cells turgid.
Harmful effects of transpiration:
1) Photosynthesis is limited by available water which is depleted by transpiration.
2) The humidity of rainforests is largely due to cycling of water from the root to the leaf to the atmosphere and back to the soil.
Even though-large amount of water absorbed is losť during transpiration, it is beneficial to plant in many ways. Hence it is considered as "necessary evil...