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Subjects
Science CBSE
Class 9
Natural resources
Textbook questions

21. NCERT Exemplar III

Exercise condition:

3 m.

1. Rainfall patterns depend on

the prevailing season in an area
the underground water table
the number of water bodies in an area
the density pattern of human population in an area

2. Among the given options, which one is not correct for the use of large amount of fertilisers and pesticides?

They turn the fields barren after some time
They destroy the soil fertility
They adversally affect the useful component from the soil
They are eco-friendly

3. The nitrogen molecules present in air can be converted into nitrates and nitrites by

any of the industries manufacturing nitrogenous compounds
the plants used as cereal crops in field
a biological process of carbon fixing factor present in soil
a biological process of nitrogen fixing bacteria present in soil

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