Fill in the blanks with the help of words given in bracket after each sentence.
(a) When air is contaminated by ________ substances which have a ________ effect on both the ________ and ________, it is referred to as ________. (air pollution, harmful, living, unwanted, non-living, pollutants).
(b) Many ________ are responsible for causing ________ pollution. Petroleum ________ are a major source of ________ pollutants like ________ and ________. (sulphur dioxide, refineries, industries, nitrogen dioxide, gaseous, liquid, people, air).
(c) While ________ your teeth, leaving the ________ running may waste several ________ of water. (tap, litres, brushing, washing, drops)
(d) Water which is suitable for _________ is called ________ water. (washing, bathing, drinking, potable, soft).
(e) Water which looks clean still has disease carrying ________ and ________ impurities. (insects, microorganism, particles, dissolved, harmful).

AcademicChemistryNCERTClass 8

(a) When air is contaminated by unwanted substances which have a harmful effect on both the living and non-living, it is referred to as air pollution.

(b) Many industries are responsible for causing air pollution. Petroleum refineries are a major source of gaseous pollutants like sulphur dioxide and nitrogen dioxide.

(c) While brushing your teeth, leaving the tap running may waste several liters of water.

(d) Water which is suitable for drinking, is called potable water.

(e) Water which looks clean still has disease-carrying microorganisms and dissolved impurities.
raja
Updated on 10-Oct-2022 13:27:06

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