Which process diminishes transpiration rate in semi-arid plants when soil humidity decreases significantly?

💡 Explanation

When soil humidity drops, plants produce abscisic acid which triggers stomatal closure via signaling pathways at the guard cells, limiting water loss through transpiration. Stomatal closure, therefore, is the most immediate effect, rather than cavitation, conductivity changes, or wax formation which are either slower responses or less immediately impactful.

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