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 diseases are spread by mosquitoes?
Answer: Malaria and Dengue are spread by mosquitoes.
Answer: 1.Use of insecticides and fertilizers in the fields.
2. Throwing garbage in water resources.
Q7. Name the diseases caused by drinking polluted water.
Answer: Cholera, dysentery, diarrhoea, teeth and skin diseases etc.
Q8. Write two methods of cleaning water.
Answer:
1. R.O. Filter system.
2. Water treatment plant.
Q9. What is added to water to prepare ORS?
Answer: Sugar and salt are added to water to prepare ORS.
Q10. Write two methods of stopping water pollution.
Answer: 1. Farmers should use less insecticides.
2. Polythene should be completely banned.
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