Which one of the following bacteria is not connected with nitrogen fixation?

Azotobacter

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Nitrosomonas

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Frankia

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Rhizobium

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Solution

The correct option is B Nitrosomonas
Nitrogen fixation is referred to as conversion of atmospheric nitrogen into ammonia, whereas the Nitrosomonas is a genus of Gram-negative, chemoautotrophic bacteria. This organism oxidizes ammonia into nitrite as a metabolic process.
So, the correct option is 'Nitrosomonas'.

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