Question

Water will be absorbed by root hair when:

• A. Concentration of solutes in the cell sap is high.
• B. Plant is rapidly respiring.
• C. They are separated from soil by a permeable membrane.
• D. The concentration of salts in the soil is high.

Answer 1

The correct option is A Concentration of solutes in the cell sap is high.

The absorption of water mainly takes place in the terminal ends of the roots but occurs maximum in the area of root hair (1-10 cm behind the root tip). A root hair contains cell sap which has a higher concentration of salts as compared to the soil water. Hence the root hair cells absorb water from the soil by endosmosis.