Question

114. Water column does not break its connection from
the tracheary element during ascent of sap. Which
physical property is responsible for the above?
(1) Cohesive forces
(2) Surface tension for capillarity
(3) Adhesive forces between ligno cellulosic wall
and water molecules
(4) Cohesion and adhesion both
​

Answer 1

due to both cohesion and adhesion no breakage

Answer 2

The ascent of sap means the upward movement of water. There are many forces which work together for this movement.

Capiliairty action, the transpirational pull is the responsible forces for the same.

As per the capillarity action, limited water rises from the tube due to the force of cohesion which exists between the water molecule and their adhesion to other substance allows this water to move up.

So, the answer is both adhesion and cohesion force.