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Question
What are the different types of water?
Solution
The different types of water present in soil can be classified as:
- Gravitational water: The water which percolates deep in the soil, due to gravity is called ‘gravitational water’. This water goes beyond the reach of roots of most of the plants, thus is not available to plants for absorption.
- Hygroscopic water: Hygroscopic water refers to the thin film of water that tightly adheres to soil particles due to adsorption forces. This type of water is usually not available to plants because it is held too firmly by the soil particles. Hygroscopic water is the moisture that clings to the surface of soil particles through adsorption.
- Combined water: Water present in the form of hydrated oxides of silicon, aluminium, etc., is called ‘combined water’. It is also not available to plants for absorption. iv. Capillary water: Some amount of water is held in pores present between the neighbouring soil particles, due to capillarity. This is called capillary water which is available for absorption.
- Capillary Water: Capillary water refers to the moisture that is retained in the soil and is held around the soil particles by capillary forces. This type of water is essential for plant growth as it is the primary source of water available to plant roots. Capillary water is the water that remains in the soil after gravitational water has drained away. It is held in the small pores of the soil due to surface tension and adhesion to soil particles.
RELATED QUESTIONS
Water present in the form of hydrated oxides of Silicon, Aluminium is called ______.
Define the following:
Gravitational water
Identify the components by which cell wall of root hair is formed.
Plants absorb water from the ______.
Identify the type of water available for absorption by plant roots.
Identify labels I, II, III in the given figure of root showing different regions.
Plants absorb water from the ______.
Which of the following refers to the water present in the form of hydrated oxides of silicon, aluminium, etc.?
Identify the correct match of type of water given in Column-I and its character in column-II and select the correct option.
| Column-I | Column· II | ||
| (i) | Capillary water | (a) | Present in the form of hydrated oxides of Silicon and Aluminium |
| (ii) | Hygroscopic water | (b) | Goes down through large pores between soil particles and reach water table |
| (iii) | Combined water | (c) | Held in between small non-colloidal soil particles |
| (iv) | Gravitational water | (d) | Held tightly around soil particles by adhesive forces |
Fill in the column 'B' with appropriate answer:
| Column A | Column B | ||
| (I) | Water adsorbed on soil particles | (a) | ______ |
| (ii) | Water penetrated deep in soil | (b) | ______ |
| (iii) | Water present as hydrated oxides | (c) | ______ |
| (iv) | Water present between soil particle | (d) | ______ |
(Capillary water, Combined water, Hygroscopic water, Gravitational water)
