Question

The water utilization by plants is available in the form of:

• A. Gravity water
• B. Hydroscopic water
• C. Capillary water
• D. Chemical water

Answer 1

The correct option is C Capillary water

Capillary water
(i) The water content retained in the soil after the gravitational water has drained off from the solid and held in the soil against the force of gravity is known as capillary water.
(ii) This water is held in the soil by surface tension as a continuous film around the soil particles and in the capillary pores between the soil particles.
(iii) The plants’ roots gradually absorb the capillary water which thus constitutes the principal source of water for plant growth.
Hygroscopic water
(i) It is that water which is absorbed by the particles of dry soil from the atmosphere and is held as a very thin film on the surface of the soil particles due to adhesion or attraction between the surface of particles and water molecules.
(ii) Below the permanent wilting point the soil contains only hygroscopic water.
(iii) Since hygroscopic water is held with considerable force, it cannot be removed easily from the soil particles.
Chemical water
It is that water that is chemically bonded with particles and cannot be extracted by the plants.