Correct option is D
The correct answer is: (D) Capillary water
Explanation:
In a well-drained soil, the capillary water is the most useful form of moisture available to plants. It is held in the micropores of soil against gravity but still accessible to plant roots.
This water remains in the soil after gravitational water has drained and before the soil dries to the point where only hygroscopic water remains.
Information Key Points:
Capillary water is held at field capacity and is available to plants.
It is retained in soil pores by surface tension and can move toward roots.
Additional Information:
Water of adhesion: Thin layer of water tightly bound to soil particles.
Hygroscopic water: Adsorbed strongly on soil particles and unavailable for plant use due to high binding energy.
Gravitational water: Moves freely through soil due to gravity; drains quickly.
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