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Which of the following is an aerobic nitrogen-fixing bacterium?

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in Biology – Class 12 by (271k points)
Which of the following is an aerobic nitrogen-fixing bacterium?

(a) Azotobacter

(b) Clostridium

(c) Rhodospirillum

(d) Rhodopseudomonas

This 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

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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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