Which outcome occurs when atmospheric humidity rapidly declines during plant transpiration?

💡 Explanation

When humidity declines, the water potential gradient between the leaf and air increases, which triggers the abscisic acid (ABA) signaling pathway leading to stomatal closure that minimizes water loss. Therefore, stomata close to conserve water, rather than experiencing accelerated photosynthesis, increased root pressure, or a more positive xylem potential, which would all occur under high humidity conditions.

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