Transpiration is a process in which there is a loss of water in the form of water vapors from the aerial parts of a plant mainly through the leaves is called transpiration. Transpiration also includes guttation which is the process of loss of water in the form of water droplets from an uninjured or intact plant.
Studies have revealed that about 10 % of moisture found in the atmosphere is due to transpiraion.
Types of Transpiration:- Most of the transpiration occurs through the foliar surface of the plants. Therefore, it is known as the foliar transpiration. Foliar transpiration accounts for 90% of the total transpiration. All other aerial parts of the plant like stem, flowers, fruits etc. are also taking part in transpiration. Mature stem shows little transpiration. Depending upon the plants parts transpiration is of following types:-
a) Stomatal Transpiration:- It is the most common type of transpiration that occurs through the minute pores present on the surface of the leaves called stomata. Stomatal transpiration constitute about 50-97% of the total transpiration. Water vapours, therefor, pass outwardly through stomata by diffusion. The stomatal transpiration continue till the stomata are kept open.
Stomatal Transpiration
b) Cuticular Transpiration:- Cuticle is a layer of wax like- covering on the epidermis of the leaves. It is meant to check transpiration. However, some water may be lost through it.Thus the loss of water in the form of water vapour from the cuticle is called cuticular transpiration. It is about the 3-10% of the total transpiration. Cuticular transpiration occurs throughout day or night.
Showing stomatal and cuticular transpiration.
c) Lenticular Transpiration:- It is found only in the woody branches of the trees where lenticels occur.The lenticular transpiration is only 0.1% of the total transpiration. It continues day and night because lenticles have no mechanism of closure.
d) Bark Transpiration:- This type of transpiration occurs through corky covering of the stems. Bark transpiration is very little. Bark transpiration also occurs throughout day and night.
Studies have revealed that about 10 % of moisture found in the atmosphere is due to transpiraion.
Types of Transpiration:- Most of the transpiration occurs through the foliar surface of the plants. Therefore, it is known as the foliar transpiration. Foliar transpiration accounts for 90% of the total transpiration. All other aerial parts of the plant like stem, flowers, fruits etc. are also taking part in transpiration. Mature stem shows little transpiration. Depending upon the plants parts transpiration is of following types:-
a) Stomatal Transpiration:- It is the most common type of transpiration that occurs through the minute pores present on the surface of the leaves called stomata. Stomatal transpiration constitute about 50-97% of the total transpiration. Water vapours, therefor, pass outwardly through stomata by diffusion. The stomatal transpiration continue till the stomata are kept open.
Stomatal Transpiration
b) Cuticular Transpiration:- Cuticle is a layer of wax like- covering on the epidermis of the leaves. It is meant to check transpiration. However, some water may be lost through it.Thus the loss of water in the form of water vapour from the cuticle is called cuticular transpiration. It is about the 3-10% of the total transpiration. Cuticular transpiration occurs throughout day or night.
Showing stomatal and cuticular transpiration.
c) Lenticular Transpiration:- It is found only in the woody branches of the trees where lenticels occur.The lenticular transpiration is only 0.1% of the total transpiration. It continues day and night because lenticles have no mechanism of closure.
d) Bark Transpiration:- This type of transpiration occurs through corky covering of the stems. Bark transpiration is very little. Bark transpiration also occurs throughout day and night.
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