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प्रश्न
What is meant by the term ‘atmosphere’? State the role played by the atmosphere for the survival of mankind.
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उत्तर
A blanket of air around earth is called the atmosphere. Without an atmosphere, life would not be possible, as the atmosphere protects us from harmful gases. We could not live without the air present in the atmosphere. In the absence of the atmosphere, the earth would get so cold at night that we would not be able to survive. No \[\ce{CO2}\] and \[\ce{N2}\] for plants without atmosphere.
संबंधित प्रश्न
Write ‘True’ or ‘False’ in front of following statement.
Atmospheric nitrogen is directly absorbed by the plants to form plant proteins.
Give two uses of the following component present in air:
oxygen
Give two uses of the following component present in air:
carbon dioxide
Define the following:
Respiration
Write ‘true’ or ‘false for the following;
Air is a compound.
A mixture has a variable composition. Give three other reasons why air is considered a mixture and not a compound.
Why is it said that-
Air is a homogeneous mixture of various gases.
Fill in the blank:
The gas evolved as a product of combustion as well as respiration is ______.
Draw a neat labelled diagram for the following experiment.
To study the presence of carbon dioxide in air.
Air has no ______ & ______.
