Compared to towering trees, the rate of upward water transport in other plants is____________?
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Answer: B. 1 mh-1
Explanation
In many non-woody or smaller plants the rate of upward water transport averages around one meter per hour. Xylem vessels conduct water and dissolved minerals from roots up to leaves at this measured speed. Transpiration pull drives water columns upward through narrow xylem conduits at moderate velocities. Water transport rates vary dramatically between small herbaceous plants and towering canopy trees. Cohesion-tension theory explains how water molecules stick together while moving up plant stems. Root pressure also contributes slightly to pushing water upward in smaller herbaceous plant species.
Botanists measure sap flow rates to understand how environmental drought stress affects plant hydration. Agricultural irrigation scheduling depends on knowing how fast crops transport water through stems. Tree species often achieve much higher transport rates than smaller plants to supply towering canopies. Eight meters per hour represents a much faster transport rate typically found in large trees. Seven meters per hour exceeds the normal transport speeds measured in smaller herbaceous plants. Four meters per hour is faster than the standard baseline rate observed in smaller vegetation.
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