Which of the following organisms that is involved in nitrogen fixation is free living?

Rhizobium

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Nitrosomonas

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Phytoplankton

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Algae

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Solution

The correct option is B Nitrosomonas
Rhizobium and Nitrosomonas help in nitrogen fixation. Unlike Rhizobium which exists in a symbiotic relationship with the leguminous plants, Nitrosomonas are free living organisms.

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