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(D) The most widely accepted theory for the ascent of sap in tall trees is the $Cohesion-Tension-Transpiration$ pull model.$1$. $Cohesion$: The mutual

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Cohesion of water and transpiration pull

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(D) The most widely accepted theory for the ascent of sap in tall trees is the $Cohesion-Tension-Transpiration$ pull model.$1$. $Cohesion$: The mutual attraction between water molecules due to hydrogen bonding allows the water column to remain intact without breaking.$2$. $Adhesion$: The attraction of water molecules to the polar surfaces of the xylem vessel walls.$3$. $Transpiration$ $pull$: As water evaporates from the stomata of leaves,it creates a negative pressure (tension) in the xylem,which pulls the entire water column upwards from the roots to the leaves.Therefore,the combination of cohesion and transpiration pull is the primary mechanism for water transport in tall trees.

Which of the following contributes most to the transport of water from the ground to the leaves of a tall tree? Or,the factor or process which best explains the rise of water from roots to the top of a tall tree is:

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Assertion $A$: In the process of ascent of sap,water rises as a continuous column.
Reason $R$: The cohesive force between water molecules is very high.
Which option is correct for Assertion $A$ and Reason $R$?

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