TYPES OF TRANSPIRATION

Transpiration.

The evaporation of water from the aerial parts of the plant especially through stomata of leaves is a process called transpiration. Base of classification. There are three types of transpiration depending upon the route of escape of water vapours from the aerial parts of the plant.

(i) Cuticular transpiration

(ii) Lenticular transpiration

(iii) Stomatal transpiration Cuticular transpiration

The loss of water in the form of water vapours through the cuticle of leaves is called cuticular transpiration. %age of transpiration. About 5-7% of total transpiration takes place through this route. Permeability of cuticle. The cuticle present on the upper and lower epidermis of leaves is not completely impermeable to water and some water is lost in the form of vapours through cuticle. The thinner the cuticle the greater is the rate of transpiration; although the composition of cuticle is also important. At night When the stomata are almost closed, cuticular transpiration takes place. Most of the factors which affect rate of