i. We cannot see air but we can feel it.
ii. The blanket of air surrounding the earth is known as atmosphere.
iii. Oxygen is essential for supporting life on the earth.
iv. Air occupies space.
v. Winnowing is more effective in moving air.
i. Air is found everywhere. True
ii. Soil does not contain air. False
iii. The moving air makes it possible for you to fly your kite. True
iv. Carbon dioxide supports burning of a candle. False
v. Birds, bats and insects can fly due to the presence of air. True
Ans. Under 21%
Ans. Carbon dioxide
Ans. Wind mill
Q10. What makes firki to rotate?
Ans. Moving air makes firki to rotate.
Ans. Air in motion is called wind.
Ans. The high velocity winds or Storms
Ans. Those tiny shining particles are the dust particles present in the air.
Ans. The envelope of air that surrounds the earth is known as atmosphere.
Ans. Plant release oxygen in the air by the process of photosynthesis.
Ans. The component of air used by green plants to make their food is carbon dioxide.
Ans. Air is called mixture of gases because it is made up of many different gases.
Ans. Pages of an open book begin fluttering when the fan is switched on because of air.
Ans. Air is a mixture of nitrogen, oxygen, carbon dioxide, water vapor and a few other gases. Some dust particles may also be present in it.
Ans. We cannot see the air around us but we can feel its presence when the leaves of the trees rustle or the clothes hanging on a clothes-line sway.
Ans. Carbon dioxide gas is used in fire extinguishers because it does not support combustion.
Ans. Take some soil in a glass. Then add water to it, the air bubbles comes out of the soil. These bubbles indicate the presence of air in the soil.
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