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← Nature & AnimalsWhich outcome occurs when high evaporative demand exceeds leaf's xylem capacity?
A)Stomata close preventing CO2 intake✓
B)Increased internal oxygen for photorespiration
C)Enhanced water uptake by root osmosis
D)Increased production of photosynthetic sugars
💡 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.
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