When the level of contaminants in air becomes so much that air becomes harmful for living beings, it is called ________.

air pollution

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water pollution

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noise Pollution

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all of the above

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Solution

The correct option is A air pollution
When the level of contaminants in the air becomes so much that air becomes harmful to living beings; it is called air pollution.

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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).

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When the level of contaminants in air becomes so much that air becomes harmful for living beings, it is called ________.

The correct option is A air pollutionWhen the level of contaminants in the air becomes so much that air becomes harmful to living beings; it is called air pollution.

The correct option is A air pollution
When the level of contaminants in the air becomes so much that air becomes harmful to living beings; it is called air pollution.