Water reaches the top of a plant due to

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(C) The primary driving force for the ascent of sap in plants is transpiration. Transpiration creates a negative pressure (tension) in the xylem vesse

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Transpiration

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(C) The primary driving force for the ascent of sap in plants is transpiration. Transpiration creates a negative pressure (tension) in the xylem vessels due to the evaporation of water from the stomata in the leaves. This tension pulls the water column upwards from the roots to the top of the plant,a process known as the cohesion-tension-transpiration pull model.

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