A column of water within xylem vessels of tal | 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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tensile strength of water.

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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.Due to the cohesion force,the water column can bear a tension or pull of up to $100 \ atm$.Therefore,the cohesion force is also referred to as 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,which acts between the vessel walls and water molecules.Additionally,surface tension accounts for high capillarity through tracheids and vessels.

$A$ column of water within xylem vessels of tall trees does not break under its weight because of

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