Which risk profoundly increases when a plant adapts to drought by increased abscisic acid production affecting stomata?

💡 Explanation

When water is scarce, increased abscisic acid promotes stomatal closure to minimize water loss through transpiration, thereby limiting CO2 intake for photosynthesis and therefore decreasing leaf’s photosynthetic efficiency. Therefore reduction in photosynthetic rate results, rather than diseases, depletion, or herbivory which have different environmental and biochemical causes.

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