Stoma (singular)/ Stomata (plural) are the small pores in the plant’s leaf epidermis that allows the exchange of gases (carbon dioxide and oxygen) between the external environment and plants. A stoma is surrounded by two guard cells. These guard cells take up the water by osmosis that forces the stoma to open. The opening of stoma allows the uptake of carbon dioxide from the environment (Fig 15).
Fig 15 shows the process of uptake of carbon dioxide by stoma in the leaves
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