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, liters, 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, microorganisms, particles, dissolved, harmful).

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Solution

(a) When air is contaminated by unwanted substances which have a harmful effect on both the living and nonliving, 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-di-oxide and nitrogen dioxide.
(c) While brushing your teeth, leaving the tap running may waste several liters of water.
(d) Water that is suitable for drinking is called potable water.
(e) Water that looks clean still has disease-carrying microorganisms and dissolved impurities.

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Question 21
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).

Question 21
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).

Q. A is a point source of water pollution, while is a non-point source of water pollution.

Q. Water that is suitable for drinking is called
(a) polluted water
(b) potablle water
(c) salt water
(d) Both (a) and (c)

Fill in the blanks.

(a) The density of water is ………… g/cc.

(b) A substance that dissolves in a liquid is called a ………… .

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