Question
The rupture and fractionation do not usually occur in water column in vessel/tracheids during the ascent of sap because of
Lignified thick walls
Cohesion and adhesion
Weak gravitational pull
Transpiration pull
Solution
B.
Cohesion and adhesion
The vertical conduction of water from root to arial part of a plant is called ascent of sap. The water molecules remain joined to each other due to a force of attraction called cohesion force. The attraction between water molecules and the walls of xylem is due to adhesion forces. These forces help to ensure the continuity of the water column in xylem.
