Answer:
(a) Nitrogen gas makes up approx mistily. 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). (Also refer to Q.
6)
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