Question

what is a nitrogen fixation? and explain it.

Answer 1

hi there,

Nitrogen fixation is the chemical processes by which atmospheric nitrogen is assimilated into organic compounds, especially by certain microorganisms as part of the nitrogen cycle.


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Answer 2

I am giving you the detail of nitrogen cycle.

It is the cyclic process by which nitrogen changes from its elemental form present in atmosphere to simple molecules that enter living beings and form complex molecules. These complex molecules are then broken down again to release nitrogen back to atmosphere.
Nitrogen cycle involves following steps -

1) Nitrogen fixation --- Atmospheric nitrogen is converted to water soluble nitrates and nitrites . This is done by nitrogen fixing bacteria like azotobacter, rhizobium..

2) Nitrogen assimilation --- Plants absorb soluble nitrate ion and form amino acids, that are used for making proteins.Animals take organic nitrogen from plants directly or indirectly.

3)Ammonification --- It is the process of ammonia formation by decomposition or breakdown of dead and complex organic matter .This is done by microorganisms living in the soil ...for example -- purifying bacteria.

4) Nitrification --- It is the process of conversion of ammonia into nitrites and then to nitrates by nitrifying bacteria.

5) Denitrification ---- It is the process of reducing nitrates or ammonia present in soil to molecular nitrogen that gets back into atmosphere.This is done by microorganism like Pseudomonas.


Hope This Helps You!