The rupture and fractionation do not usually | vedclass

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(D) : Cohesion,adhesion,and surface tension are the forces responsible for the movement of water up the tracheary elements.Water molecules remain atta

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cohesion and adhesion.

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(D) : Cohesion,adhesion,and surface tension are the forces responsible for the movement of water up the tracheary elements.Water molecules remain attached to one another by a strong mutual force of attraction called cohesion force.On account of the cohesion force,the water column can bear a tension or pull of up to $100 \ atm$.Therefore,the cohesion force is also called tensile strength.Its theoretical value is about $15,000 \ atm$,but the measured value inside the tracheary elements ranges between $45 \ atm$ to $207 \ atm$.The water column does not break its connection from the tracheary elements because of another force called adhesion force between their walls and water molecules.Another force called surface tension accounts for high capillarity through tracheids and vessels.

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

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