In the following statements, the underlined words are jumbled up. Write them in their correct form. (a) Air contains 78% ginroten and 21% gonexy. (b) Vehicles produce high level of pollutants like carbon dioxide, nitrogen oxides, nobrac moondexi and mosek. (c) Carbon dioxide, thaneme, nitrous oxide and water vapour are known as heengrouse sesga. (d) Gangotri glacier in Himalaya has started melting because of lablog ringwam. (e) Whenever harmful substances such as wagese, toxic chemicals, silt, etc. get mixed with water, the water becomes potdulle.

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Solution

Air:
The gaseous mixture that makes up air is made up of different gases. Although we cannot see or smell the air, it is present all around us. Air is necessary for the survival of all living beings.
It is a gaseous substance that's colorless, tasteless, and odorless that has mass, and occupies space. It dissolves in water. and can also be compressed.
It is made up of $78 %$ Nitrogen, $21 %$ Oxygen, $1 %$ Carbon dioxide, water vapor, other gases, and dust particles. The composition of the air varies slightly from one location to the next and from one season to the next.
The correct words in the sentence are Nitrogen and Oxygen.
Therefore, the correct sentence is Air contains $78 %$ nitrogen and $21 %$ oxygen.

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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).

Q. 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)

(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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