A free living anaerobic bacterium capable of fixing nitrogen is

Answer: Anabaena, Nostoc and Cyanobacteria

Nitrogen fixation is a mechanism in which atmospheric nitrogen is fixed into the form in which plants can easily absorb nitrogen.

There are two types of nitrogen-fixing species.

(1) symbiotic species – They are non-free living bacteria.

Examples – Bradyrhizobium and Rhizobium

(2) Nonsymbiotic species – They are free-living bacteria.

Examples – Anabaena, Nostoc and Cyanobacteria

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