A free living anaerobic bacterium capable of $N_{2}$ fixation in soil is

Rhizobium

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Azotobacter

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Streptococcus

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Clostridium

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Solution

The correct option is C Clostridium
Clostridium is a free living anaerobic bacterium capable of N $_{2}$ fixation in soil as they contains nif genes which reduces the atmospheric nitrogen into the ammonia which then incorporated into the molecules via biosynthesis.
So, the correct answer is option D.

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_{2}

Rhizobium lives as an aerobic microbe under free living conditions but gets adapted to anaerobic conditions during nitrogen fixation.

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