Water A Precious Resource - Chapter Wise CBSE Solved Question and Answer Based On NCERT
Points To Remember:
Nearly 71 percent of the earth is covered by water in the form of oceans, seas, lakes, rivers, ice, ground water and moisture in the air.
Water that is fit for human consumption is called freshwater. Only 0.006 per cent of the water on the earth is actually available for our use.
Rainwater and water from other sources, like rivers and ponds, seep through the soil.
Sometimes, ground water accumulates between layers of hard rock. This is known as an aquifer. Water in aquifers can be drawn with tube wells and hand pumps.
Plants use ground water and release it in the form of water vapour during transpiration.
When the water table goes down, it is said to have been depleted.
Water management is the continuous matching of water resources with the water requirements of a place. Water management essentially involves activities that identify sources of water, prevent wastage of water, and implement recycling of water. It may also include treatment of water to make it suitable for human consumption.
Rainwater harvesting can be used to raise the water table in arid areas. It can also be used to create water storage areas.
Plants need water to absorb nutrients from the soil and make their food. Without water, plants would die, and greenery would be lost.
