Q12 of 20 Page 91

Make sentences using the given set of words.

(a) 99%, oxygen, nitrogen, air, together


(b) Respiration, dissolved, animals, air, aquatic


(c) Air, wind, motion, called

(a) Oxygen and Nitrogen together make 99% of air.


(b) Aquatic animals used dissolved air for respiration.


(c) Air in motion is called wind.


Or


Motion air is called wind.


More from this chapter

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10

In a number of musical instruments, air plays an important role. Can you name some such instruments?

 11

In the boxes of Column I the letters of some words got jumbled. Arrange them in proper form in the boxes given in Column II

 13

A list of words is given in a box. Use appropriate words to fill up the blanks in the following statements

Air, oxygen, wind, water vapour, mixture, combination, direction, road, bottles, cylinders.


(a) The ______ makes the windmill rotate.


(b) Air is a ______ of some gases.


(c) A weather cock shows the ______ in which the air is moving at that place.


(d) Mountaineers carry oxygen ______ with them, while climbing high mountains.

 14

Observe the picture given in Fig. 15.1 carefully and answer the following questions


(a) What is covering the nose and mouth of the police man?


(b) Why is he putting a cover on his nose?


(c) Can you comment on air quality of the place shown in the Fig.15.1?