Why is transpiration called ‘a necessary evil’?

1.	Why is transpiration called ‘a necessary evil’?
Answer» 1. The loss of water in the form of water vapour is called transpiration. 2. About 90 – 93% of transpiration occurs through stomata, small apertures located in the epidermis of leaves. 3. For this process stomata must remain open and then only gaseous exchange by diffusion takes places. 4. Gaseous exchange is necessary for respiration and photosynthesis. If stomata remain closed then it will affect productivity of plant. 5. The process is necessary evil because water which is important for plant is lost in the process. 6. At the same time it helps in absorption of water and its translocation. Hence it cannot be avoided. So Curtis has rightly called it as necessary evil.

Answer»

1. The loss of water in the form of water vapour is called transpiration.

2. About 90 – 93% of transpiration occurs through stomata, small apertures located in the epidermis of leaves.

3. For this process stomata must remain open and then only gaseous exchange by diffusion takes places.

4. Gaseous exchange is necessary for respiration and photosynthesis. If stomata remain closed then it will affect productivity of plant.

5. The process is necessary evil because water which is important for plant is lost in the process.

6. At the same time it helps in absorption of water and its translocation. Hence it cannot be avoided. So Curtis has rightly called it as necessary evil.

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