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Which of the following is not a free-living Nitrogen-fixing bacteria?

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in Biology – Class 12 by (271k points)
Which of the following is not a free-living Nitrogen-fixing bacteria?

(a) Azotobacter

(b) Clostridium

(c) Klebsiella

(d) Xanthomonas

This question was addressed to me in semester exam.

The doubt is from Microbes as Biofertilizers in section Microbes in Human Welfare of Biology – Class 12

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The correct option is (d) Xanthomonas

The best explanation: Some of the free-living Nitrogen-fixing bacteria are-Azotobacter, Clostridium, Klebsiella and Beijerinckia. Rhizobium, Xanthomonas and Frankia are some of the symbiotic Nitrogen-fixing bacteria.

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