Question

Passive absorption of water from the soil is mainly affected by

• A. Tissue organisation of root
• B. Sucking power of root hairs
• C. Tension of cell sap due to transpiration
• D. Osmotic concentration of cell sap

Answer 1

The correct option is C Tension of cell sap due to transpiration

Water may be absorbed both through active and passive means. Passive absorption of water occurs due to osmosis. The driving force is provided by loss of water during transpiration. In absence of transpiration, water cannot be continuously absorbed. The continuous absorption of water depends on continuous loss of water during transpiration.