NEET 2010 Biology question

One of the free-living anaerobic nitrogen-fixer is

(1)RhodospirillumCorrect
(2)Rhizobium
(3)Azotobacter
(4)Beijerinckia

Answer: (1)

Solution

Free-living nitrogen fixers include Azotobacter and Beijerinckia (aerobic), Rhodospirillum (anaerobic, photosynthetic purple non-sulphur bacterium), Clostridium and Rhodopseudomonas (anaerobic), and cyanobacteria such as

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Question ID VK-090636