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← Nature & AnimalsWhich effect results when a vascular plant's height exceeds limitations imposed by environmental aridity?
A)Diminished root hydraulic conductance increase
B)Unsustainable xylem cavitation initiates✓
C)Phloem sap ATP diffusion improves
D)Guard-cell osmotic regulation becomes enhanced
💡 Explanation
When tree height and aridity provoke excessive tension in xylem, xylem cavitation becomes irreversible because of the xylem's cohesion-tension mechanism exceeding structural limits; rather than improving sap transport or root function, unsustainable xylem cavitation occurs, therefore leading to hydraulic failure.
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