Question

Write the decreasing order of the rate of transpiration indifferent types of it. Also, explain each type of transpiration briefly.

Answer 1

Answer: Stomatal transpiration > Lenticular transpiration > Cuticlular transpiration (1 mark)
Stomatal transpiration takes place as long as the stoma remains open. And the stoma or stomata that are spread through the surface of a leaf, remain open throughout the daytime provided adequate water and minerals are present in the soil, hence, allowing a large surface area and a prolonged time for transpiration to take place.
The cuticle or waxy layer secreted by the epidermis of leaves. It allows very little or no water to escape from the surface. Hence, allowing the least rate of transpiration.
The lenticels are openings that are develop on old stems. They function as sites for gaseous exchange. Lesser water loss takes place through these cells as compared to stomata.

The amount of transpiration from lenticels is certainly more than cuticular transpiration, but much less than stomatal transpiration. (2 marks)