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Nitrogen
Fixing
Bacteria -
Nitrogen fixing microorganisms have been classified on ecological as well as physiological basis. According to the ecological classification, nitrogen fixing prokaryotes are divided into two groups, free living and symbiotic organisms.
It is now confirmed that the ability to fix nitrogen is confined exclusively to prokaryotes. Earlier reports of nitrogen fixation in eukaryote organisms (yeasts and other fungi) have not been substantiated.
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