Stomatal Transpiration

Transpiration As a Necessary Evil,
1. When the rate of transpiration is high and the soil is water-deficient, the plants may experience an internal water deficit that affects metabolic functions.
2. To control transpiration, many xerophytes must undergo structural modifications and adaptations.
3. To prevent water loss, deciduous trees must lose their leaves in the fall.
However, despite the numerous drawbacks, plants must transpire because of their unusual internal structure, especially that of their leaves. Although primarily intended for gaseous exchange for respiration, P.S., etc., their interior structure is such that it cannot prevent water from evaporating. As a result, several scientists, including Curtis (1926), have referred to transpiration as a necessary evil.