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In botany, a stoma (plural = stomata) is a tiny opening or pore. It is found on plant leaves and stems, and any other green parts of the plant. It is used for gas exchange. Stomata are mostly found on the under-surface of plant leaves. all plants have stomata.
Stomata have two main functions. First is gaseous exchange i.e. intake of carbon dioxide and release of oxygen. The second is the process of transpiration in plants.
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