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CLASS - 6 SCIENCE 

CHAPTER - 15

AIR AROUND US

QUESTIONS AND ANSWERS

Question no. 1


What is the composition of air?

Answer no. 1


The air is a composition of oxygen,nitrogen,carbon dioxide,water vapour, dust and smoke.

Question no. 2


Which gas in the atmosphere is essential for respiration?

Answer no. 2


Oxygen present in the atmosphere is essential for respiration?

Question no. 3

How will you prove that air supports burning?

Answer no. 3


Take a candle and place it in a tub. Light the candle and fill the tub with water. Now cover the candle with an inverted glass. It is observed that candle blows out after burning some time and the water level inside the inverted glass rises to some extent.

 The component part of air (i.e. oxygen) inside the glass is used up in burning. After blows out candle water occupies that space. It shows that air support burning.

Question no. 4


How will you show that air is dissolved in water?

Answer no. 4


Take a glass beaker and fill it with water. Boil it. Before it start boiling bubbles appears in the bottom,these bubbles are due to air present in water. This experiment proves that air present in the water.

Question no. 5


Why does a lump of cotton wool shrink in water?

Answer no. 5


The lump of cotton wool shrink in water because the air inside the cotton lumps are replaced by water which make the layer stick together and it shrink.

Question no. 6


6. The layer of air around the earth is known as __________________.

Answer no. 6

Atmosphere

Question no. 7


The component of air used by green plants to make their food,is ____________________.

Answer no. 7


Carbon dioxide

Question no. 8


List five activities that are possible due to the presence of air.

Answer no. 8

Activities which are possible due to air are -

 1. Respiration
2. Transpiration
3. Photosynthesis
4. Cloud formation 
5. Winnowing

Question no. 9


How do plants and animals help each other in the exchange of gases in the atmosphere?

Answer no. 9


Plants take carbon dioxide and give out oxygen. This oxygen is used by animals for respiration and expel out carbon dioxides. This carbon dioxides is used by plant to prepare food. This cycle continues so plant and animals help each other in exchange of gases in the atmosphere.

 Also see answers of the following chapters -

Garbage in Garbage out
Air around us
Water
Fun with Magnets
Electricity and Circuits
Light, Shadow and Reflection
Motion and Measurement of Distances
The Living Organisms and their Surroundings
Body Movements
Getting to know Plants
Changes Around Us
Separation of Substances
Sorting Material into Groups
Fibre to Fabric
Components of Food
Food : Where does it com from ?


















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