Continuous upward flow of water stream in tal | vedclass

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(D) The continuous upward movement of water,known as the ascent of sap,is maintained by the cohesion-tension theory. $1$. Cohesive forces (attraction

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cohesive force between molecules and transpiration pull

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(D) The continuous upward movement of water,known as the ascent of sap,is maintained by the cohesion-tension theory. $1$. Cohesive forces (attraction between water molecules) and adhesive forces (attraction between water and xylem walls) prevent the water column from breaking. $2$. Transpiration pull,generated by the evaporation of water from the leaves,creates a negative pressure (tension) that pulls the water column upward against the force of gravity.

Continuous upward flow of water stream in tall trees is maintained due to . . . . . . .

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