Question

The rupture and fractionation do not usually occur in the water column in vessel or tracheids during the ascent of sap because of

• A. Weak gravitation pull
• B. Transpiration pull
• C. Lignified thick walls
• D. Cohesion and adhesion

Answer 1

The correct option is D Cohesion and adhesion

• Terms cohesion and adhesion refer to the attractive force between water molecules and between water and xylem elements respectively.
• These forces are important to ensure a continuous column of water in xylem elements, which is lifted by transpiration pull.