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# NCERT Solutions for Class 6 Science Chapter 15: Air Around Us

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In the NCERT Solutions Class 6 Science, there are 15 chapters all of them are very important. Swiflearn offers the most correct NCERT Solutions for Class 6 Science Chapter 15 Air Around Us will make you understand its concepts & will help you in higher studies.

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## NCERT Solutions for Class 6 Science Chapter 15 Air Around Us

#### 1. What is the composition of air?

Solution:
Air is composed of water vapour, oxygen, nitrogen, carbon dioxide, dust and smoke.

#### 2. Which gas in the atmosphere is essential for respiration?

Solution:
Oxygen gas in the atmosphere is essential for respiration.

#### 3. How will you prove that air supports burning?

Solution:
The following activity can prove that air supports burning:
 Place two burning candles on a table.
 Cover one candle with an inverted glass tumbler as shown in the figure.
It will be noticed that the candle covered with the glass tumbler blows out after some time whereas the other candle continues to burn.
This happens because there is no air supply inside the glass tumbler. The air initially present in the glass tumbler is used up for burning and that is the reason why the candle does not blow off instantaneously. This shows that air supports burning.

#### 4. How will you show that air is dissolved in water?

Solution:
The following activity can be used to show that air is dissolved in water:
 Take some water in a beaker.
 Heat the beaker by placing on a tripod stand.
 Carefully observe that as the water starts boiling, small bubbles are formed at the inner surface of the beaker.
This shows that air dissolved in water escapes as water is heated.

#### 5. Why does a lump of cotton wool shrink in water?

Solution:
Lumps of cotton wool have air trapped in between them. When these lumps are placed in water, air is replaced with water and the cotton wool also becomes heavy. The removal of air causes a decreases in volume as a result of which the limps of cotton wool shrink in water.

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

Solution:
The layer of air around the earth is known as atmosphere.

#### 7. The component of air used by green plants to make their food, is ___________.

Solution:
The component of air used by green plants to make their food, is carbon dioxide.

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

Solution:
The following activities are possible due to the presence of air:
 Photosynthesis
 Respiration
 Transpiration
 Burning
 Winnowing

#### 9. How do plants and animals help each other in the exchange of gases inthe atmosphere?

Solution:
During the process of respiration, animals take in oxygen and release carbon dioxide. Plants on the other hand utilise carbon dioxide to produce food and release oxygen in the atmosphere. In this way, plants and animals help each other in exchange of gases in the atmosphere.