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Which of the following is free-living aerobic non- photosynthetic nitrogen-fixing bacterium? (a) Nostoc (b) Azospirillum (c)...

Which of the following is free-living aerobic non- photosynthetic nitrogen-fixing bacterium?

(a) Nostoc

(b) Azospirillum

(c) Rhizobium

(d) Azotobacter.

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Answer #1

(d) Azotobacter.

All plants want nitrogen to synthesize proteins, but for this motive they may be unable to make use of atmospheric nitrogen. Nitrogen fixation is added approximately by using two kinds of bacteria which are referred to as nitrogen solving bacteria. One kind is symbiotic nitrogen fixers that are related to flora e.g., Rhizobium and Azospirillum.The opposite sorts of these micro organism are unfastened living inside the soil e.g., Azotobacter and Nostoc.Nostoc is photosynthetic and Azotobacter is non- photosynthetic.In order that, the unfastened residing aerobic non-photosynthetic nitrogen solving bacterium is Azotobacter.

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