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How do guard cells help open and close a...

How do guard cells help open and close a stoma?

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Given below are certain biological statements which are incomplete and hence incorrect. Rewrite the correct form of the statement by inserting suitable word/words at right place. Do not delete any word already given in the statement. Underline the inserted word/words. The opening and closing of stomata is controlled by guard cells.

Assertion: Each stoma is composed of two bean shaped cells known as guard cells. Reason: Guard cells regulate the opening and closing of stomata.