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← Nature & AnimalsWhich consequence of elevated air temperatures occurs during high-volume xylem flow?
A)Increased risk of xylem cavitation buildup✓
B)Reduced phloem sugar translocation gradient
C)Enhanced cuticular wax deposition on leaves
D)Decreased root hydraulic conductance locally
💡 Explanation
Cavitation risk elevates with temperature because the increased transpiration rate strains the cohesion-tension mechanism in xylem, therefore drawing water too rapidly. This induces vapor bubble formation, rather than maintaining the continuous water column via capillary action at pits.
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