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Stomata are microscopic pores found mostly on the underside of leaves. They are located in the epidermal tissue. Each stoma is surrounded by a pair of specialized, kidney shaped cells called guard cells, which possess chlorophyll and regulate the opening and closing of stomata. The primary function of stomata is to allow gaseous exchange during photosynthesis and respiration between the plant's internal tissues and the atmosphere. The process of transpiration also takes place through stomata.
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