Guard cells are helpful in:

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(A) Guard cells are specialized plant cells that surround the stomata. They regulate the opening and closing of stomata by changing their turgor press

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Transpiration

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(A) Guard cells are specialized plant cells that surround the stomata. They regulate the opening and closing of stomata by changing their turgor pressure. This process directly controls the rate of transpiration (the loss of water vapor from the plant surface) and the exchange of gases ($CO_2$ and $O_2$) required for photosynthesis and respiration.

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