Ascent of sap is best explained by.

Mass (bulk) flow

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Pulsation theory

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Root pressure

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Cohesion-tension transpiration pull

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Solution

The correct option is A Cohesion-tension transpiration pull
The cohesion-tension theory is a theory of intermolecular attraction that explains the process of water flow upwards (against the force of gravity) through the xylem of plants. Transpiration pull, utilizing capillary action and the inherent surface tension of water, is the primary mechanism of water movement in plants.
Answer is D.

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