NCERT Class VIII Science Solutions: Chapter 18-Pollution of Air and Water Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 1:

What are the different ways in which water gets contaminated?


Water gets contaminated in the following ways:

  • Various industrial units dispose - off wastage including harmful chemicals in rivers. These chemicals are poisonous and contaminate water.
  • Water gets contaminated when sewage is disposed - off (without proper treatment) in rivers.
  • Ground water gets contaminated by harmful insecticides and pesticides sprayed by farmers and it get mixed with drinking water through rain water.
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Question 2:

At an individual level, how can you help reduce air pollution?


Air pollution should be checked at individual level:

  • At individual level, we can plant trees as trees reduce air pollution.
  • We can use public transportation and encourage carpooling so that air pollution can be reduced.
  • Instead of going by cars and scooters for short distances, we can go by foot or by bicycles.
  • By saying no to crackers we can minimize air pollution as well as noise pollution.
  • We should not burn garbage and dry leaves. The burning of dry leaves and garbage release greenhouse gases which are responsible for global warming.
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Question 3:

Clear, transparent water is always fit for drinking. Comment.


Transparent water is not always fit for drinking. It may contain harmful microorganisms, soluble salts and other pollutants. Sometime water looks like pure but it contains dissolved salts or bacteria which are not good for us. We should purify water before drinking. Water can be purified with the help of water purifier or by boiling it.

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