Question

Wheat
29.
Which of the following has maximum percentage of availability of water ?
(1)
Rivers
(2)
Lakes
(3) Atmospheric water
(4) Ground water​

Answer 1

Answer:

(4)Ground Water

Explanation:

In earth,50% of water is present in ground water.

Answer 2

Answer:

Option (4) Groundwater

Explanation:

• Some of the rainwater runs off the surface due to natural slopes and gets collected in water reservoirs such as lakes, rivers, ponds, etc. It is called run-away water and is not available to the plants.

• The rest of the water which is held by the soil particles occurs in the form of gravitational water, groundwater, hygroscopic water, combined water etc.

• An appreciable amount of water moves deep down the soil after heavy rainfall due to the gravitational pull.
• It is called gravitational water as it gets accumulated in the deep situated zone of the earth known as the water table.
• The water table shows the upper level of water just under the ground level which is filled with water. This water lies beyond the availability reach and thus is not available.

• Combined water constitutes the form of water that forms the chemical composition of soil particles. It occurs in the form of hydrated oxides of aluminium, iron, silicon etc. This form is also not an available source.

• Hygroscopic water refers to the water held tightly in the form of a thin film around the soil particles. The bonding between water molecules and soil particles is the result of cohesive and adhesive forces and cant be easily removed. Thus it is also not an available source.

• The water held by the thin capillaries i.e. pore spaces formed by the soil particles is called the groundwater or the soil water after the movement of gravitational water has stopped.

• Groundwater is the water found below the water table and is often present deep under the ground. The principal source of groundwater or soil water is rainfall or precipitation. Thus it is the available source with the maximum percentage of availability of water.

Hence option (4) Groundwater​ has the maximum percentage of availability of water is correct.