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stomate
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stomata stoma with guard cells
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stomata
stomata Stomata on the surface of a leaf seen under a microscope.

stomate

plant anatomy
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Also known as: stoma, stomas, stomata
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The Editors of Encyclopaedia Britannica
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Also called:
stoma
Plural:
stomata or stomas

stomate, any of the microscopic openings or pores in the epidermis of leaves and young stems. Stomata are generally more numerous on the underside of leaves. They provide for the exchange of gases between the outside air and the branched system of interconnecting air canals within the leaf. A stomate opens and closes in response to the internal pressure of two sausage-shaped guard cells that surround it. The inner wall of a guard cell is thicker than the outer wall. When the guard cell is filled with water and it becomes turgid, the outer wall balloons outward, drawing the inner ...(100 of 238 words)

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