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Question

Which of the following is not a nitrogen fixing cyanobacteria?

A
Anabaena
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B
Azotobacter
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C
Nostoc
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D
Oscillatoria
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Solution

The correct option is B Azotobacter
Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial environment many of which can fix atmospheric nitrogen. Anabaena, Nostoc and Oscillatoria are nitrogen fixing cyanobacteria (Blue Green algae) while Azobacter and Azospirillum are nitrogen fixing free living bacteria.

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