Question

Choose the correct answers from the alternatives given.
What role cohesion and adhesion play in xylem transport?

• A. Like transpiration, they create a tension
• B. Like root pressure, they create a positive pressure
• C. Like sugars, they cause water to enter xylem
• D. They create a continuous water column in xylem

Answer 1

The correct option is D They create a continuous water column in xylem

Cohesion is the mutual attraction between water molecules. Adhesion is the attraction of water molecules to polar surfaces (such as walls of xylem vessels). These both forces together helps in the formation of a thin, unbroken column of water which leads to the mass flow of water in apoplastic pathway.

Hence, the correct answer is 'They create a continuous water column in xylem'.