Question

Water will be absorbed by root hairs when

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

Answer 1

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

Water moves from a region of its own high concentration to a region of its own low concentration. If the cell sap is highly concentrated as compared to soil solution- it means water molecules are present in high concentration in the soil solution and in low concentration in the cell sap. In such a situation water molecules will move along their concentration gradient and readily move inside the root hairs.