what is transpiration full theory (ascent of sap)?
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●The theory states that transpiration pull
or tension, cohesion property of water, and hydration of the cell walls (i.e., adhesion) are collectively responsible for the ascent of sap.
●Water movement through the xylem is a bulk flow caused by ΔΨp (pressure difference) between one end of the system and the other
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for by a mechanism, called transpiration pull, that involves the evaporation of water from leaves. Thus, the explanation for the upward movement of sap in trees is also called the transpiration-cohesion hypothesis.
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