DAV Class 4 Science Solution Chapter 9 Safe Handling and Storage of Water
DAV School Books Class 4 Science Solution Chapter 9 Safe Handling and Storage of Water all Question Answer. DAV Class 4 9th Chapter Safe Handling and Storage of Water full Chapter explanation by expert teacher.
DAV School Books Class 4 Science Solution Chapter 9 Safe Handling and Storage of Water:
A.)
1.) Potable water.
2.) Dirt and germs.
3.) Filtration
4.) Boiling and chlorination
5.) Clean and covered
B.)
1.) True
2.) False
3.) True
4.) False
5.) True
C.)
1.) Chlorination
2.) Jaundice
3.) Filtration
4.) Digestion food
D.)
1.) Water which is clean and fit for drinking, is called potable water.
2.) Jaundice and diarrhea are the two diseases that can be caused by drinking unclean water.
3.) Malaria, dengue and chikungunya are spread by mosquitoes.
4.) Boiling is the most common mode of purifying the water. Boiling kills the germs present in water.
5.) Two methods of purification of water, boiling and chlorination.
6.) Safe handling of purified water is very important to keep the germs away. Some ways of safe handling of water are given below:
- Water should always be stored in clean and covered containers.
- We should never dip our hands in water stored for dinking purpose.
E.)
1.) Drinking unclean water can cause diseases like jaundice, diarrhea, dysentery and cholera. We should take care to drink clean and pure water. Therefore we need to purify water before drinking it.
2.) Filtered water can also be purified by adding a correct small amount of chlorine in it. This process is called chlorination. This kills germs and makes it fit for drinking.
3.) A traditional filter method contains sand and gravel. Filtration removes dust and other suspended particles from water but this method does not remove germs. So the traditional method of filtration not completely sufficient for making water fit for drinking.
4.) Dirty and stagnant water is major cause of diseases. Such water is a breeding place for mosquitoes. Mosquitoes spread diseases like malaria, dengue and chikungunya. So we all need to take care that water is not allowed to stagnate around our houses.
5.) Two ways that can be used to prevent breeding of mosquitoes in room coolers are,
- We should change water in room coolers after every 3-4 days.
- When water in the room coolers cannot be changed two spoons of kerosene should be put in it to keep the mosquitoes away.
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