Question

Transpiration is a necessary evil.

Answer 1

transpiration is a necessary evil as itlose water in the summer leading to the drying of hte tree 

Answer 2

Transpiration has both advantages and disadvantages as well, to plants. So it is a ' necessary evil ' .

Ⓐ. $\bf\underline\red{ Advantages \: of \: Transpiration }$

1. It creates ' $\sf\purple{ transpiration \: pull }$ ' for absorption and transportation of water 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 by evaporative cooling.
5. It maintains the shape and structure of plants by keeping cells turgid.

Ⓑ. $\bf\underline\orange{ Disadvantages \: of \: Transpiration }$

1. Excessive transpiration makes the cells flacid.
2. This retards growth of the plants.
3. More amount of water is evaporated by transpiration.
4. Thus photosynthesis is limited by the available water.

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