Chapter 15
Air Around Us
Exercise
I. Answer the following questions in brief:
Ans 1 - 99.2%
Ans 2 - Carbon-Di-oxide
Ans 3 - Those are the dust particles in the air.
Ans 4 - Fine hair and mucus present in our nostrils to prevent dust particles from getting into the respiratory system.
Ans 5 - We should not breathe through our month because harmful dust particles may enter your body.
Ans 6 - Because when they climb mountains, as altitude increases, the amount of oxygen level in the atmosphere air decreases. As a result, mountaineers suffer from dizziness.
Ans 7 - Animals like earthworms living in the soil come out of the soil when it rains heavily because rainwater fills in their burrows and in order to respire they come out of the soil.
Ans 8 - (a) The windmills is used to draw water from tube wells.
(b) Windmills are clean and green sources of power.
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