2. What are Nitrogen fixers? Name any two.
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Two kinds of nitrogen-fixing microorganisms are recognized: free-living (nonsymbiotic) bacteria, including the cyanobacteria (or blue-green algae) Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia, and Clostridium; and mutualistic (symbiotic) bacteria such as Rhizobium, associated with leguminous plants.
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Rhizobium bacteria lives in the root nodules of leguminous plants
example - Azotobacter, Beijerinckia
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