A free living anaerobic nitrogen fixing bacterium is

Rhizobium

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Streptococcus

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Azotobacter

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Clostridium

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Solution

The correct option is D Clostridium
Nitrogen-fixing bacteria are those bacteria which fixes atmospheric nitrogen and make it available for the plants. There are 2 types of nitrogen-fixing bacteria, free-living (nonsymbiotic) bacteria and non free living (symbiotic) bacteria. Examples of free-living bacteria includes , cyanobacteria like Anabaena and Nostoc, Azotobacter, Clostridium. Out of these examples, Azotobacter is aerobic bacterium and Clostridium is anaerobic bacterium. Examples of symbiotic bacteria includes Rhizobium, Bradyrhizobium
So, the correct answer is 'Clostridium'

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