Chapter : 6. Natural Resources
Nitrogen Cycle
Nitrogen Cycle :
The atmosphere is the source of N2 where it is about 79%. Plant cannot use N2 directly.
In living organisms nitrogen is important constituent of protein and nucleic acid.
The N2 cycle has five important steps –
Nitrogen Fixation :
Conversion of N2 gas into its compounds like nitrates & nitrites is called N2 fixation. It is done either non-biologically by lightening or biologically by symbiotic or free- living bacteria. O2 is harmful for N2fixing bacteria.
Assimilation of Nitrogen :
N2 cannot be used by plants directly. They absorb it in the form of nitrate. Nitrate later on reduced to ammonia which provide amino (–NH2) group. It is important part of proteins.
The atmosphere is the source of N2 where it is about 79%. Plant cannot use N2 directly.
In living organisms nitrogen is important constituent of protein and nucleic acid.
The N2 cycle has five important steps –
Nitrogen Fixation :
Conversion of N2 gas into its compounds like nitrates & nitrites is called N2 fixation. It is done either non-biologically by lightening or biologically by symbiotic or free- living bacteria. O2 is harmful for N2fixing bacteria.
Assimilation of Nitrogen :
N2 cannot be used by plants directly. They absorb it in the form of nitrate. Nitrate later on reduced to ammonia which provide amino (–NH2) group. It is important part of proteins.
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