Question

What is biological nitrogen fixation? Give examples of microbes associated with
fixation.​

Answer 1

Answer:

Examples of this type of nitrogen-fixing bacteria include species of Azotobacter, Bacillus, Clostridium, and Klebsiella. As previously noted, these organisms must find their own source of energy, typically by oxidizing organic molecules released by other organisms or from decomposition.

Answer 2

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$\implies$The Nitrogen Cycle is Biogeochemical Cycle that describe the transformation of nitrogen and nitrogen-containing compounds in nature.

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1. Nitrogen Fixation: It is the process by which nitrogen gas in the atmosphere is converted into compounds of nitrogen. It take place in three ways:

a) Biological Nitrogen Fixation: It is the conversion of atmospheric nitrogen into compound of nitrogen by the action of certain living organisms, like rhizobium bacteria which reside in the root nodules of leguminous plants.

b) Atmospheric Nitrogen Fixation: During lightning, atmospheric nitrogen combines with oxygen to form nitrogen oxides. These oxides react with rain water and are carried to the earth in the form of nitrous and citric acids. This is called atmospheric nitrogen fixation. Minerals in the soil can convert nitric acid to soluble nitrates, which can be used by plants.

c) Industrial Fixation: Fertilisers consisting of nitrogen in the form of ammonia or urea or ammonium nitrate are produce to be added to the soil. This is know as industrial fixation of nitrogen.

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