A free living anaerobic bacterium capable of fixing nitrogen is ____ .
It is a mechanism in which the atmospheric nitrogen is fixed into the forms in which can be easily absorbed by plants.
There are two types of nitrogen-fixing species.
(1) Symbiotic species – These bacteria that form symbiotic relationship with other organisms.
Examples – Bradyrhizobium and Rhizobium
(2) Nonsymbiotic species – They are free-living bacteria.
Examples – Anabaena, Nostoc and Cyanobacteria
Final answer: A free living anaerobic bacterium capable of fixing nitrogen is cyanobacteria.