define guard cells in English
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each of a pair of curved cells that surround a stoma, becoming larger or smaller according to the pressure within the cells.
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Guard cells are two bean-shaped cells that surround a stoma. As epidermal cells, they play an important role in gaseous exchange in and out of plant leaves by regulating the opening and closing of pores known as a stoma. In addition, they are the channels through which water is released from leaves to the environment.
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