(A) Guard cells regulate the opening and closing of stomata,which directly controls the rate of transpiration. Transpiration is the evaporative loss o

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(A) Guard cells regulate the opening and closing of stomata,which directly controls the rate of transpiration. Transpiration is the evaporative loss of water by plants,occurring mainly through the stomata in the leaves. During photosynthesis,the opening of stomata also facilitates the exchange of gases like $CO_2$ and $O_2$.