Question

write a short note on transpiration ​

Answer 1

Explanation:

TRANSPIRATION is the process of water movement through a plant and its evaporation from aerial parts such as stems, leaves and flowers.

Hope you understand.

Answer 2

Answer:                                                                                                     Meaning of Transpiration:

If a bell jar is placed on a pot, a film of moisture appears on its dry inner surface indicating loss of water as vapours which condense on the cool inner surface of the bell jar. The loss of water from the aerial parts of the plant in the form of water vapours is called transpiration. Leaves are the principal organs of transpiration and most of the transpiration takes place through their stomata.

This is termed as stomatal transpiration. A small amount of water vapours is lost from the leaves and herbaceous stems by direct evaporation from the epidermal cells through the very thin cuticle. This is called cuticular transpiration.

The amount of water lost through stomatal transpiration is very high. The loss of water vapours also takes place through lenticels of fruits and woody stems. This is called lenticular transpiration. In woody stems, transpiration takes place through bark or cork.

Factors Affecting Transpiration:

Whenever the rate of transpiration exceeds the rate of absorption, a water deficit is created in the plants and results in the incipient wilting of leaves. The development of internal water deficit in a plant causes Ψ gradient between the guard cells and the mesophyll and epidermal cells surrounding the cells.

This gradient favours outward movement of water from the guard cells and the reduced turgor causes the complete or partial closure of the stomata. Yemm and Willis (1954) found that conditions causing an internal water deficit also cause an increase in starch content of the guard cells.