VERY SHORT ANSWER QUESTIONS

Q.1 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.

Ans.
(a) True. Plants consume oxygen for respiration, especially during the night when photosynthesis is not occurring.
(b) True. Plants produce oxygen during the process of photosynthesis, which occurs in the presence of sunlight.
(c) False. Air plays a significant role in the flight of birds and airplanes by providing lift and propulsion through wings and engines, respectively.
(d) False. Air occupies space, as demonstrated by its ability to fill containers and exert pressure.

Q.2 In a number of musical instruments, air plays an important role. Can you name some such instruments?

Ans. Air plays an important role in a number of musical instruments such as mouth organ, harmonium, shehnai, trumpet, trumpet and flute.

Q.3 In the boxes of a column I the letters of some words got jumbled. Arrange them in proper form in the boxes given in column II.

Ans. Here are the arranged words:

Q.4 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

Ans.
(a) Oxygen and nitrogen together make up 99% of the air.
(b) Aquatic animals rely on dissolved oxygen in the air for respiration.
(c) The motion of air is called wind.