"Transpiration is a necessary evil”. Explain.

Advantages of Transpiration :
* It supplies water for photosynthesis.
* It helps in transports minerals from the soil to all parts of the plant.
* It cools leaf surfaces, sometimes 10 to 15 degrees, by evaporative cooling.
* It maintains the shape and structure of the plants by keeping cells turgid.
Disadvantages of Transpiration :
* Excessive transpiration makes the cells flaccid which retards growth.
* Excessive transpiration leads to closure of stomata thus obstructing gaseous exchange.
* Hence it is considered to be a “necessary evil”.