Answer:
(c) Large number
of tiny pores called stomata are present on the surface of the leaves of plants.
The gaseous exchange as well as transpiration takes place through these pores.
The opening and dosing of the pore is a function of the guard cells.
The guard cells
swell when water flows into them, causing the stomata pores to open.
Similarly
the pore closes if the guard cells shrink or losses water in them.
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