Answer:
Epidermis of a leaf is not continuous at all the places
due to the presence of small pores, called stomata. Each stoma is bounded by a
pair of specialized epidermal cells or two kidney-shaped cells called guard
cells. The concave sides of these guard cells face each other and have a space
forming the stomatal opening.
The stoma allows gaseous exchange to occur during
photosynthesis and respiration.
During transpiration water vapour escapes through stomatal
opening, this results in appearance of water vapour on the wall of glass jar,
if a potted plant is covered with it.
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