Important Questions for CBSE Class 6 Science Chapter 11 - Air Around Us

Very Short Answer Questions:

1. State whether true or false. If false, correct the statement. 

1. Air is always stationary. 

Ans: False. Air can move and moving air is called wind. 

2. Air is present everywhere.

Ans: True. 

3. Air occupies space. 

Ans: True.

4. Air is coloured. 

Ans: False. Air is transparent and colourless. 

5. The layer of air surrounding earth is called oxygen. 

Ans: False. The layer of air surrounding the earth is called the atmosphere.

6. Nitrogen does not support burning. 

Ans: True.

7. Plants use oxygen for respiration and carbon dioxide for photosynthesis.

Ans: True. 

8. Dust particles are present in the air. 

Ans: True.

9. Oxygen cannot be dissolved in water.

Ans: False. Oxygen can be dissolved in water.

10. Windmills require electricity to function.

Ans: False. Windmills function by the action of wind to generate electricity.

Short Answer Questions:                                                                                     3 Marks

2. Why do mountaineers carry oxygen cylinders while climbing high altitudes?

Ans: The atmosphere thins out at high heights. As a result, the amount of oxygen available at high elevations will decrease and at high elevations, there will be less oxygen available for breathing and respiration. Therefore, mountaineers carry oxygen cylinders in order to breathe efficiently. 

3. Why does burning a fire in a closed room cause suffocation?

Ans: Any fuel that is burned consumes the oxygen in the room and produces carbon dioxide. Because the chamber is closed, neither new oxygen nor accumulated carbon dioxide can enter or exit. As a result, we have less oxygen to breathe and more carbon dioxide enters our bodies. Carbon dioxide is poisonous to our bodies, and because there is less oxygen available for breathing when carbon dioxide is burned in a closed space, asphyxia occurs.

4. How is oxygen in the atmosphere replaced?

Ans: Organisms utilise oxygen for their respiration. Because all living species require oxygen to breathe, the oxygen level will drop. The action of photosynthesis replaces oxygen in the atmosphere. The process by which plants produce food is known as photosynthesis. In the presence of sunlight and chlorophyll, plants use carbon dioxide and water to make glucose and oxygen. This process produces oxygen, which is then released into the atmosphere.

5. Why should we breathe through the nose and not the mouth?

Ans: Our nose contains two nostrils, each coated with a dense layer of tiny hairs. These hairs filter the air we breathe in, removing dust and smoke particles. As a result, dangerous airborne particles do not reach our bodies. Because our mouths lack such a filtering mechanism, breathing via our mouths increases the odds of dangerous dust and smoke particles entering our lungs.

6. Why do earthworms come out of the soil during heavy rains?

Ans: There are spaces in the soil where air can be found. Animals that dwell in the soil need the air contained in the soil spaces to breathe. During severe rains, all of these air spaces are filled with water, making it impossible to breathe. That is why, following heavy rains, soil dwellers such as earthworms emerge from the soil to get oxygen directly from the air.

Long Answer Questions:                                                                            5 Marks

7. What is the importance of air in our lives?

Ans: We use air in various day to day activities such as:

• Air contains oxygen, which we need to breathe.

• Plants consume carbon dioxide in the air during photosynthesis.

• Air produces a protective atmosphere over the globe, which helps to keep the temperature stable.

• Air is required for the movement of ships, yachts, and planes.

• Birds need air to fly.

• Air is required for pollination of seeds.

• Windmills are used to generate electricity.

Important Related Links for CBSE 6 Science

Conclusion

Reviewing all the crucial questions for Class 6 Science Chapter 11 - Air Around Us provides students with a solid grasp of the chapter's topics. The extra and important questions for Class 6 Science Chapter 11 - Air Around Us engage in a concept-focused discussion, encompassing all chapter themes. This question-and-answer method proves time-saving during exam prep, offering an efficient way to revise the chapter and enhance understanding. Practising these important questions streamlines preparation and boosts confidence for the upcoming exams.