explain the two types of nitrogen fixation
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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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1. Free living(non symbiotic) bacteria. Ex- cyanobacteria, anabena,nostoc
2.Mutualistic that is symbiotic bacteria. Ex-rhizobium, azospirillum
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