DAV Class 4 Science Solution Chapter 8 Water Scarcity and Conservation of Water
DAV School Books Class 4 Science Solution Chapter 8 Water Scarcity and Conservation of Water all Question Answer. DAV Class 4 8th Chapter Water Scarcity and Conservation of Water full Chapter explanation by expert teacher.
DAV School Books Class 4 Science Solution Chapter 8 Water Scarcity and Conservation of Water:
A.)
1.) Blue planet
2.) Rain and snow
3.) Sharp decrease
4.) Decrease
5.) Wastage
B.)
1. Cutting of tress in the forests |
c. deforestation |
2. Collecting rain water for day to day use |
d. rain water harvesting |
3. Proiper utilization of water and avoiding its wastage |
a. Water conservation |
4. A method of preserving large quantity of water and checking floods |
b. dam |
C.)
1.) c (rain and snow)
2.) d (increasing the rainfall)
3.) c (washing our car with jet of water)
D.)
1.) Three-fourth of the surface of earth is covered by water.
2.) Three sources of fresh water is rivers, streams or lake.
3.) For deforestation the number of trees being cut is more than that being planted. This decrease in the number of trees , result in a decrease rainfall.
4.) Trees are cut and forest are being cleared for building house and factories.
5.) Dams can be constructed to check floods. Dam also help to preserve large quality of water.
E.)
1.) Three factors that are responsible for water scarcity are population, deforestation and setting-up of factories.
2.) Big factories are being set-up at different places. This is to meet the growing demand of foodstuff, clothing and other materials. The factories need a large quantity of water. They fulfill this need by using underground water. Due to shortage of rainfall, underground water does not get filled up again as much as it is used. This has led tom a sharp decrease in the level of underground water.
3.) We all need to do as much harvesting of rain water as possible.
In cities rain water flows directly into drains. It should be collected in large underground tank from where it seeps slowly into the ground.
Rain water may also be collected in overhead tanks and used for daily needs.
4.) Over-irrigation of fields should be checked and water sprinkler should be used for irrigation. This reduces the wastage of water.
5.) We can conserving water at our home by adopting the following measures:
a.) Turn off the tap after using it.
b.) Do not kept the tap running while brushing teeth or washing hands.
c.) Use a mug and bucket to take bath instead of a pipe.
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