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Natural Resources — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceNatural Resources1 Mark
MCQ
The nitrogen molecules present in air can be converted into nitrates and nitrites by:
  • ✓
    A biological process of nitrogen fixing bacteria present in soil.
  • B
    A biological process of carbon fixing factor present in soil.
  • C
    Any of the industries manufacturing nitrogenous compounds.
  • D
    The plants used as cereal crops in field.
✓

Answer

Correct option: A.
A biological process of nitrogen fixing bacteria present in soil.

Nitrogen gas makes up approximately. $78\%$ of our atmosphere and nitrogen is also a part of molecules essential for life like proteins, nucleic acids $(DNA$ and $RNA).$ It is thus an essential nutrients for all life forms.
The nitrogen molecules present in air can be converted into nitrates and nitrites by a biological process of nitrogen fixing bacteria (present in the soil or present in association with plants).

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