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Question

The rupture and fractionation do not usually occur in the water column in vessels/tracheids during the ascent of sap because of


A
Lignified thick walls
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B
Cohesion and adhesion
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C
Weak gravitational pull
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D
Transpirational pull
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Solution

The correct option is B Cohesion and adhesion

The vertical conduction of water from aerial parts of plant is called the ascent of sap. The water molecules remain joined to each other due to the force of attraction called cohesion force. Attraction between water molecules and the walls of xylem is due to the adhesion force. These forces help to ensure the continuity of water column in xylem


Biology

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