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← Nature & AnimalsWhich constraint affects xylem transport at high altitudes?
A)Reduced atmospheric pressure decreasing cavitation✓
B)Lower water potential increasing xylem viscosity
C)Elevated CO2 levels minimizing photorespiration
D)Increased radiation causing chloroplast photo-bleaching
💡 Explanation
Reduced atmospheric pressure lowers the boiling point of water, thereby increasing cavitation risk via vapor-lock in xylem. Because tension is interrupted, water transport is diminished; therefore optimal water transfer is limited, rather than enabled by other options.
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