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Which of the following is an aerobic nitrogen-fixing bacterium?(a) Azotobacter(b) Clostridium(c) Rhodospirillum(d) RhodopseudomonasThis question was addressed to me in quiz.My question comes from Microbes as Biofertilizers topic in chapter Microbes in Human Welfare of Biology – Class 12

Answer»

The correct answer is (a) Azotobacter

Easy explanation: Some of the aerobic nitrogen-fixing bacteria are Azotobacter and Beijerinckia. Some of the anaerobic nitrogen-fixing bacteria are Clostridium, Rhodospirillum and Rhodopseudomonas. SOIL is ENRICHED through exudation and FORMATION of NITRATES after their DEATH and decay.



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