Question : Present cohesion-tension-transpiration pull model of water

1.	Question : Present cohesion-tension-transpiration pull model of water transport.
Answer» Solution :In xylem the FLOW of water upward through in PLANTS by transpiration is mainly dependent on following physical characteristics. Cohesion Force : MUTUAL attraction between water MOLECULES. Adhesion Force : attraction of water molecules to polar surfaces (such as the surface of tracheary elements). Surface Tension : water molecules are attracted to each other in the liquid phase more than to water in the gas phase. These PROPERTIES give water high tensile strength, as ability to resist a pulling force and high capillarity. The ability to rise in thin tubes. In plants capillarity is aided by the small diameter of the tracheary elements the tracheids and vessel elements.

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