5.------are free living N fixing bacteria.
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Azospirillum
Rhizobium
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An overview of nitrogen fixation. Two kinds of nitrogen-fixing bacteria are recognized. The first kind, the free-living (nonsymbiotic) bacteria, includes the cyanobacteria (or blue-green algae) Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia, and Clostridium.
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Rhizobium is the answer
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