NCERT Class VI Science Solutions: Chapter 15-Air Around us Part 1

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Question 1:

What is the composition of air?

Answer:

Air contains some water vapour, dust particles and gases. The gases in air are mainly nitrogen, oxygen, small amount of carbon dioxide, and many other gases. In fact, nitrogen and oxygen together make up 99% of the air. The remaining 1% is constituted by carbon dioxide and a few other gases, water vapour and dust particles.

As showing in images is a composition of air

Composition of Air

As showing in images is a composition of air

Question 2:

Which gas in the atmosphere is essential for respiration?

Answer:

Oxygen gas in the atmosphere is essential for respiration.

As showing in images is a result for oxygen cycle

Result for Oxygen Cycle

As showing in images is a result for oxygen cycle

It breaks down food and releases energy during respiration.

Question 3:

How will you prove that air supports burning?

Answer:

Place a burning candle upright in a tray having water. Cover it with a glass jar. Water will make it air-tight. During burning, oxygen is consumed and carbon-dioxide is released. After sometime no oxygen is left inside the jar and flame goes out. It shows air support burning.

As showing in images is a oxygen is consumed and carbon-dioxide is released

Oxygen is Consumed and Carbon-Dioxide is Released

As showing in images is a oxygen is consumed and carbon-dioxide is released