NCERT Solutions for Class 6 Science Chapter 15 Air Around Us
Answer :
Fix two small candle of the same length on the table. Light both the candles. Cover one of the candles with an inverted glass tumbler. Observe both the candles carefully.
We must have observed that the candle covered with glass tumbler got extinguished after some time, whereas
the other candle continued burning. Then proved air support burning Because the glass which did not have oxygen, the candle was extinguished.
NCERT Solutions for Class 6 Science Chapter 15 Air Around Us
Answer :
Take some water in a glass vessel or beaker. Heat it slowly on a tripod stand. Before the water begins to boil, look carefully at the inner surface of the vessel. You will see tiny bubbles on the inside. On heating, air dissolved in water escapes in the form of these bubbles.
NCERT Solutions for Class 6 Science Chapter 15 Air Around Us
Answer :
In photosynthesis, plants take carbon dioxide and give out oxygen. The animals breath in oxygen in respiration and carbon dioxide is given out which is again used by plants for photosynthesis, that is, preparation of food by plants. This is how plants and animals help each other in the exchange of gases in the atmosphere.