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← Nature & AnimalsWhich consequence results in tall trees when atmospheric pressures decrease significantly?
A)Increased xylem cavitation and embolism✓
B)Enhanced phloem sap translocation rates
C)Decreased stomatal transpiration resistance
D)Reduced photosynthetic carbon fixation
💡 Explanation
Lower pressures increase the vapor pressure gradient, thereby accelerating water evaporation; this increases tension in xylem leading to xylem cavitation. This bubble formation disrupts the cohesion-tension mechanism because air blocks water transport, therefore, less water available, rather than enhanced transport through xylem.
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