Transpiration in plants | NMDCAT 2021
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- เผยแพร่เมื่อ 8 ก.พ. 2025
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About This Video ........................
In This Video Lecture You Will Learn Basic Concept Of Transpiration
You have already studied the role of transpiration, in ascent of sap.
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
(i) Cuticular transpiration : The loss of water in the form of water vapours through 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
route.
which afect rate of transpiration, in general, are also important in controlling the rate of cuticular
of leaves is called cuticular transpiration. About 5-7% of total transpiration takes place through this
to water and some water is lost in the form of vapours through cuticle. The thinner the cuticle
(ii) Lenticular transpiration : Lenticular transpiration is the loss of water vapours through
transpiration.
The cuticle present on the upper and lower epidermis of leaves is not completely impermeable
lenticels present in the stem of some plants. All plants do not possess lenticels.
(iii) Stomatal transpiration : It is a type of transpiration in which the water vapours escape
through stomata. In isobilateral leaves the stomata are present, in both, upper and lower epidermis
The guard cells are normally dumble or bean-seed-shaped. The inner concave sides of two guard
e.g. lily and maize leaf. In dorsiventral leaves the stomata are conined to only the lower epidermis.
cells enclose the stoma. This inner side of guard cell has very thick cell wall, but the outer convex
side has thin cell wall. The guard cells are the only cells, of leaf epidermis, which are not connected
is stomatal.
by plasmodesmata to other epidermal cells, and which have chloroplasts - and thus are involved
in the process of photosynthesis (Fig. 14.8). When these guard cells are turgid, the stoma between
them opens and when the guard cells are laccid the stoma between them closes. The degree of
opening of stomatal pores also afects the rate of transpiration. 90% of total transpiration in a plant
The cells of mesophyll of leaf provide enormous surface ‘area for the loss of water in the form of
vapours. The pathway of water vapours loss to the atmosphere, through stomata
About This Channel.....................
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Now I understand each and every thing about transpiration in plants
Respected Sir lily and maize are monocot
Like your lectures very much
Thank you
Shukran Shukran!! 👌👌👌
Goood n best!
sr ap ne transport in the animal pr lecture vedio nahi ki plz us pr bhi bnae
Ki ha mdcat walii
@@ALIACADEMYAR7 yes sr g ml gae ha , actually phle mjy mli nahi yhe or thank you so so so so so much
Sir inner wall of stomata elastic you say non elastic
Maize to monocot hai leaf bhi parallel hai root bhi Adevtitious hai fir aap Dicot kah rahe kaise Sir
Bhai maize monocot h
Aur water lily bhi monocot he