Q1. List the activities carried on by people near water sources that pollute the water ?
Answer : 1. Washing of clothes near water resources.
2. Bathing of animals near water resources.
3. Throwing garbage in water resources.
Q2. Which disease are spread by mosquitoes ?
Answer:- Malaria and Dengue are spread by mosquitoes.
Q6. Write the answers of the following in brief:
(a) Write any two reasons of water pollution.
Answer:- 1. Use of insecticides and fertilizers in the fields.
2. Throwing garbage in water resources.
(b) Name the diseases caused by drinking polluted water.
Answer: Cholera , dysentery , diarrhoea , teeth and skin diseases etc.
(c) Write two methods of cleaning water.
Answer : 1. R.O. Filter system
2. Water treatment plant
(d) What is added to water to prepare ORS ?
Answer: Sugar and salt are added to water to prepare ORS.
(e) Write two methods of stopping water pollution.
Answer : Farmers should use less insecticides. Polythene should be completely banned.
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