38.Cohesion force existing amongst water molecules contributes to A. Plasmolysis B. Ascent of sap C. Osmosis D. Translocation of nutrients
Option B. Cohesion force is the intermolecular force which helps in the adhesion of molecules present in a same matter. It is a form of attractive force. ∙ It is also present among the water molecules in order to maintain the continuity of the water. ∙ This Cohesive force in the water molecules is essential for the ascent of the sap because of higher transpiration rate. ∙ The force allows the water molecules to resist the separation between them and it arises because of the hydrogen bond between the water molecules. ∙ The ascent of the sap also occurs when the water potential of the guard cells decrease is as compared to the surrounding cells ∙ To neutralize water potential is provided from the neighboring cells that creates a pull in the xylem vessels.
