Which one of the following is not associated with ascent of sap in tall trees.

Cohesion and adhesion of water molecules

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Continuity of water column

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Transpiration pull

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Pressure in tracheary elements.

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Solution

The correct option is D
Pressure in tracheary elements.

In xylem elements, negative hydrostatic pressure gradient due to transpirational pull is responsible for water movement. Due to this tension water is pulled up through the plant. The cohesion of water molecules and their adhesion to the xylem wall aids in this process.

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In the absence of transpiration, cohesion and adhesion of water molecules enables the rise of water.

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