Question

The transpiration-driven ascent of xylem sap depends mainly upon _______ property of water.

• A. Cohesion
• B. Adhesion
• C. Surface tension
• D. All of these

Answer 1

The correct option is D All of these

There is a continuous column of water from root through the stem and into the leaves. The water column is present in tracheary elements. The column of water does not fall down under the impact of gravity because forces of transpiration provide both energy and necessary pull. Cohesion, adhesion and surface tension-keep the water in place.