Question

Assertion: The surface tension of water is one of the reasons of high capillarity through tracheids and vessels.

Reason: Water molecules are attracted to one another more than the water molecules in the gaseous state.

• A. if both A and R are true and R is the correct explanation of A
• B. if both A and R are true but R is not the correct explanation of A
• C. if A is true but R is false
• D. if both A and R are false.

Answer 1

The correct option is A

if both A and R are true and R is the correct explanation of A

The cohesiveness of water molecules accounts for its surface tension. Also, water exerts adhesion forces towards the walls of xylem. Together, the surface tension and adhesion result in the capillary rise through tracheids and xylem vessels.