question_answer 62)

Will the ascent of sap be possible without the cohesion and adhesion of the water molecules? Explain.

Answer:

                  No, the ascent of sap is not possible without the cohesive and adhesive properties of water as they play an important role in transport of water because of the following reasons (i) Cohesion forces hold together the water molecule in the conducting channels, sovacuum is not created. (ii) Adhesive forces between the water molecule and cellulose of cell wall make a thin filmof water along the channels so, this film can be pulled up by transpiration pull drawingmore and more water upwards in the conducting channels from the root.