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Subjects
Science CBSE
Class 9
Natural resources
Textbook questions

23. NCERT Exemplar V

Exercise condition:

3 m.

1. Which step is not involved in the carbon-cycle?

Transpiration
Photosynthesis
Respiration
Burning of fossil fuels

2. Ozone-hole’ means

small holes scattered in the ozone layer
thickening of ozone in the ozone layer
a large sized hole in the ozone layer
thinning of the ozone layer

3. Ozone-layer is getting depleted because of

excessive deforestation
excessive use of man-made compounds containing both fluorine and chlorine
excessive use of automobiles
excessive formation of industrial units

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