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← Nature & AnimalsWhich outcome limits xylem transport up tall trees when soil moisture drops significantly around root structures?
A)Increased embolisms and hydraulic failure✓
B)Elevated abscisic acid production
C)Decreased stomatal resistance to water
D)Reduced osmotic root pressure overall
💡 Explanation
Increased drought stress causes cavitation of the xylem, where gas bubbles break the water column that is maintained in the xylem by cohesion-tension, because reduced osmotic pressure, therefore decreasing effective transport, rather than allowing it to adapt further.
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