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← Nature & AnimalsWhich outcome occurs when cut herbaceous plants lack free-flowing water columns subject to tension?
A)Decreased photosynthetic rate occurs
B)Increased rate of embolism expansion✓
C)Elevated phloem translocation occurs
D)Down-regulation of CO₂ occurs
💡 Explanation
An increased rate of embolism expansion occurs, due to cavitation. When the water column is disrupted, tension from transpiration causes air to be drawn into the xylem because pressure differential overwhelms surface tension, therefore embolism rapidly expands, rather than maintaining a water column.
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