What do you mean by biological nitrogen fixation?

Conversion of atmospheric nitrogen into useful nitrogen compounds by bacteria and algae.

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Conversion of nitrogen compounds into ammonia by chemical process.

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Conversion of atmospheric nitrogen into useful nitrogen compounds by lightning.

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Conversion of nitrogen compounds into free nitrogen by bacteria and algae.

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Solution

The correct option is A Conversion of atmospheric nitrogen into useful nitrogen compounds by bacteria and algae.
Biological nitrogen fixation means conversion of atmospheric nitrogen into useful nitrogen compounds by bacteria and algae. Bacteria like Rhizobium, present in the root nodules of leguminous plants, as well as some blue-green algae help in the fixation of atmospheric nitrogen.

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