Chapter 15: Air Around Us

Q9Written answer

State whether the following statements are true or false. If false, correct them.

(a) Plants consume oxygen for respiration.

(b) Plants produce oxygen during the process of making their own food.

(c) Air helps in the movements of sailing yachts and glider but plays no role in the flight of birds and aeroplanes.

(d) Air does not occupy any space.

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Ans: True

Ans: False because air helps in the flight of birds and aeroplanes.

Ans: False because air occupies space.

Q10Written answer

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

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Ans: Such instruments are flute, mouth organ, trumpet, shehnai and harmonium.

Q11Written answer

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.

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Answer:

Q12Written answer

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

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Ans: Nitrogen and oxygen together make up $99\% $ of the air.

Ans: Aquatic animals use dissolved air for respiration.

Ans: Air in motion is called wind.

Very Short Answer Questions