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NCERT Solutions for Class 6 Science - Air Around us

Q1. What is the composition of air?
Ans: Air contains some gases mainly nitrogen, oxygen, small amount of carbon dioxide, water vapour and dust particles.


Q2. Which gas in the atmosphere is essential for respiration?
Ans: Oxygen in the atmosphere is essential for respiration.


Q3. How will you prove that air supports burning?
Ans: 
Step I: Two shallow containers are taken and burning candles are fitted into it.
Step II: Now, water is filled in the container at two different levels.
Step III: Both the candles are then covered with glass.
Step IV: After sometimes, we observed that the candles having less water in its container lights off.
This happened because the container having more water contains more oxygen and therefore it burnt for more time. Thus, it is proved that air supports burning.


Q4. How will you show that air is dissolved in water?
Ans: 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 its boiling point, the bubble of air start rising from bottom to surface. These bubbles come from the air dissolved in water.
NCERT Solutions for Class 6 Science - Air Around us

Water contains air


Q5. Why does a lump of cotton wool shrink in water?
Ans: A lump of cotton wool has a lot of air trapped inside the space present in its fibers. When this lump of cotton is immersed in water, all the air is replaced by water. Due to this, the cotton lump shrinks down.


Q6. The layer of air around the earth is known as _______.
Ans: The layer of air around the earth is known as the atmosphere.  Atmosphere consists of various gases such as Nitrogen, Oxygen, etc.  

Q7. The component of air used by green plants to make their food, is _______.
Ans: The component of air used by green plants to make their food, is carbon dioxide. 
The oxygen in air is used by the organisms present in air, water or soil or on earth for their respiration. During respiration carbon dioxide gas is released to air. But green plants during photosynthesis use carbon dioxide of air for preparing food and they release oxygen gas in the air.

  • Natural sources of carbon dioxide include most animals, which exhale carbon dioxide as a waste product.
  • Human activities that lead to carbon dioxide emissions come primarily from energy production, including burning coal, oil, or natural gas.    


Q8. List five activities that are possible due to the presence of air.
Ans: The five activities that are possible due to air are as follows:

  • Photosynthesis
  • Cloud formation
  • Respiration
  • Transpiration
  • Winnowing


Q9. How do plants and animals help each other in the exchange of gases in the atmosphere?
Ans: Plants take in carbon dioxide in during photosynthesis give out oxygen in the atmosphere while animals take in oxygen and breathe out carbon dioxide during respiration. In this way, plants and animals help each other in the exchange of gases in the atmosphere.

The document NCERT Solutions for Class 6 Science - Air Around us is a part of the Class 6 Course Science Class 6.
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FAQs on NCERT Solutions for Class 6 Science - Air Around us

1. What is air and why is it important?
Ans. Air is the mixture of gases that surrounds the Earth. It is important because it provides oxygen for living organisms to breathe, helps regulate the Earth's temperature, and plays a crucial role in various natural processes.
2. How is air polluted and what are the main sources of air pollution?
Ans. Air pollution occurs when harmful substances are released into the air, making it impure and potentially dangerous to breathe. The main sources of air pollution include industrial emissions, vehicle exhausts, burning of fossil fuels, and dust and smoke from construction sites.
3. What are the effects of air pollution on human health?
Ans. Air pollution can have several negative effects on human health. Breathing in polluted air can lead to respiratory problems such as asthma, bronchitis, and lung cancer. It can also worsen existing health conditions and cause allergies, eye irritation, and cardiovascular diseases.
4. How does air pollution impact the environment?
Ans. Air pollution can have detrimental effects on the environment. It contributes to the depletion of the ozone layer, leading to global warming and climate change. It also harms plants and animals, disrupts ecosystems, and causes acid rain, which damages soil, water bodies, and vegetation.
5. What are some measures to reduce air pollution?
Ans. There are several measures that can be taken to reduce air pollution. These include using cleaner fuels and technologies, promoting renewable energy sources, implementing stricter emission standards for industries and vehicles, practicing sustainable agriculture, and increasing awareness about the importance of air quality.
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