Which outcome occurs when high evaporative demand exceeds leaf's xylem capacity?

💡 Explanation

Stomata closure occurs via abscisic acid signaling when xylem cannot resupply water to leaves; this causes turgor loss in guard cells, closing stomata and preventing CO2 intake, because photosynthesis would starve. Rather than increased oxygen or sugar production, CO2 starvation dominates.

• Which gas exchange outcome occurs in succulents when CAM pathway stomata open at night?
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