Answer in brief:

(a) Why is river water unfit for drinking ?

(b) Why is tap water a mixture ?

(c) What is mineral water?

(d) What is the purpose of adding bleaching powder to water supplied to the town?

(e) How is chemically pure water obtained in the laboratory?

(f) How is water in a swimming pool kept free from germs?

(g) Why is water important for plants and animals?

Name the steps involved in the purification of drinking water supplied in cities and towns.

Give reason:

Marine life is able to survive in colder regions.

Give reason:

Water droplets can be seen outside a chilled water bottle.