Air Around Us Class 6th Question Answers

Air Around Us is Chapter 15 taken from JKBOSE Class 6 Science. You will get short notes and question answers in the chapter Air Around Us in this post. The previous post was about Chapter 14 Water Question Answers. Let’s get started by having an overview of what you have studied in this chapter. You have learned about the following topics in detail in this chapter:

Air Around Us Class 6th Question Answers

Overview of Chapter

• IS AIR PRESENT EVERYWHERE AROUND US?
• WHAT IS AIR MADE UP OF?
• HOW DOES OXYGEN BECOME AVAILABLE TO ANIMALS AND PLANTS LIVING IN WATER AND SOIL?
• HOW IS THE OXYGEN IN THE ATMOSPHERE REPLACED?

IS AIR PRESENT EVERYWHERE AROUND US? Air is present everywhere around us although we cannot see it we can feel its presence. The containers which appear empty are also filled with air. Air is invisible, it cannot be seen but can be felt. It occupies space and has mass. It dissolves in water. Air can be compressed. It is a mixture of different gases and other particles.

WHAT IS AIR MADE UP OF? Air is a mixture of many gases, e.g. nitrogen, oxygen, carbon dioxide, argon, water vapour and many other gases present in the atmosphere.

The gases in the air are mainly nitrogen 78.9%, and oxygen 20.9%, the remaining 0.2% is made up of gases, e.g. argon, carbon dioxide and a small amount of other gases. There are also small quantities of dust, smoke and water vapours present in the air.

HOW DOES OXYGEN BECOME AVAILABLE TO ANIMALS AND PLANTS LIVING IN WATER AND SOIL?  The oxygen becomes available to animals and plants living in water for breathing (respiration) in the form of dissolved oxygen. The animals which live in the soil and the roots of plants which grow in the soil get oxygen from the air present in spaces between the soil particles.

HOW IS THE OXYGEN IN THE ATMOSPHERE REPLACED: The oxygen in the atmosphere is used by all organisms for respiration but the amount of oxygen must be replaced otherwise the quantity of oxygen will decrease and eventually vanish from the earth. But it is not so, the amount of oxygen is constantly replaced by plants through the process of photosynthesis.

Air Around Us Class 6 Questions

Exercises

1. What is the composition of air?

Ans. Air is a mixture of gases mainly nitrogen and oxygen gases with small amounts of carbon dioxide gas, water vapours and other gases. There may be some dust particles present in the air.

1. a) Nitrogen: 78%
2. b) Oxygen: 21%
3. c) Carbon dioxide: 0.03%
4. d) Gases like helium and hydrogen: 0.17%
5. e) Water vapours and dust particles.

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

Ans. Oxygen gas in the atmosphere is essential for respiration.

3. How will you prove that air supports burning?

Ans. Take a candle and fix it on a table. Light a candle by burning a matchstick. The candle will continue to burn in this case. It is because fresh air is continuously available to the candle for burning.

Now, cover the burning candle by putting an inverted glass jar over it. Observe it carefully. After some time candle stops burning. It is because when the candle is covered by a glass jar it uses the oxygen necessary for burning from the air inside the jar.

Since only a small amount of air is present inside the jar, so all of the oxygen is used up in a short time and the candle stops burning. It clearly shows that air is necessary for burning.

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

It can be shown by a simple activity. Take a small amount of water in a beaker or vessel. Heat it slowly on a heater or a gas stove. Before water begins to boil, look carefully at the inner surface of the vessel. The tiny bubbles of air are seen on the inner surface of the vessel before the water starts boiling. The bubbles are from the air dissolved in the water. This activity shows that air is dissolved in water.

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

Ans. A lump of cotton has air in it in the spaces between the cool wool. When water is poured on it or when a lump of cotton is dipped in water, the air present in the cotton wool gets displaced and appears in the form of bubbles. As a result, a lump of cotton wool shrinks in water.

6. The layer of air around the earth is known as the atmosphere.
7. 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.

Ans. Following are some activities which are possible due to the presence of air.

1. Process of Photosynthesis by plants.
2. Respiration by all living organisms.
3. Rotating windmills for power generation.
4. Burning of substances.
5. Pollination in flowers of plants.
6. Formation of clouds.
7. Winnowing of grains.

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

Ans. Plants and animals are interdependent in the exchange of gases. Plants use carbon dioxide for the process of photosynthesis which is released during the process of respiration in animals. On the other hand, animals use oxygen for the process of respiration which is produced during the process of photosynthesis by plants.

10. Plants need carbon dioxide to make their food. (JKBOSE TEXTBOOK)
11. The moving air is called wind. (JKBOSE TEXTBOOK)

That’s all about Air Around Us Class 6th Question Answers. Hope it has helped. Do share your views about this post in the comment section below.