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Subjects
Science CBSE
Class 9
Natural resources
Textbook questions

19. NCERT Exemplar I

Exercise condition:

3 m.

1. The atmosphere of the earth is heated by radiations which are mainly

re-radiated by land
re-radiated by land and water
re-radiated by water
radiated by the sun

2. If there were no atmosphere around the earth, the temperature of the earth will

increase during day and decrease during night
increase
be unaffected
go on decreasing

3. What would happen, if all the oxygen present in the environment is converted to ozone?

We will be protected more
It will become poisonous and kill living forms
Ozone is not stable, hence it will be toxic
It will help harmful sun radiations to reach earth and damage many life forms

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