Q12 of 287 Page 362

What is air?

Air is a mixture of gases like carbon dioxide, nitrogen, oxygen and water vapour that occurs in the atmosphere.


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10

Narne the region of atmosphere where (a) ozone layer is present (b) Most of the atmospheric gases are present.

 11

What percentage of carbon dioxide is present in the atmosphere?

 13

Why is life on Mars and Venus planets not possible?

 14

Name the two important biological processes in which air is essential.