NCERT Class VI Science Solutions: Chapter 15-Air Around us Part 2

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Question 4:

How will you show that air is dissolved in water?

Answer:

Take some water in a glass vessel or beaker. Heat it slowly on a tripod stand. Look carefully at the inner surface of the vessel, before reaching to its boiling point, the bubble of air start rising from bottom to surface. These bubbles come from the air dissolved in water.

As showing in images is a air is dissolved in water

Air is Dissolved in Water

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Question 5:

Why does a lump of cotton wool shrink in water?

Answer:

Sufficient volume of air is present in the cotton wool. When dipped in water, this air is replaced by less volume of water, so it shrinks.

As showing in images is a result for lump of cotton wool shr …

Lump of Cotton Wool Shrink in Water

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Question 6:

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

Answer:

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

Question 7:

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

Answer:

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

Question 8:

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

Answer:

  • Living beings use air for respiration.

  • Plants use air (carbon dioxide) to prepare their food.

  • Blowing air (wind) is used for power generation by wind mills.

  • Air helps in burning of fuels and substances.

  • Air helps in the scattering of seeds and pollens of plants.

  • Air helps in the movements of sailing yachts, gliders, parachutes and aeroplanes.

Question 9:

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

Answer:

There is the interdependence of plants and animals. Plants and animals respire i.e. they intake oxygen and gives out carbon dioxide in the atmosphere. Plants take carbon dioxide from the atmosphere and prepare food and return oxygen to atmosphere by the process of photosynthesis. So, in this way plants and animals help each other in the exchange of gases in the atmosphere.

As showing in images is a exchange of gases in the atmospher …

Exchange of Gases in the Atmosphere

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