Which of the following does not fix atmospheric nitrogen?

Nostoc

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Anabaena

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Spirogyra

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Azotobacter

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Solution

The correct option is C Spirogyra
Blue green algae like Nostoc and Anabaena have some thick walled cells, called as heterocysts, which are specialized for nitrogen fixation. Azotobacter is aerobic, free-living soil microbe, which plays an important role in the nitrogen cycle in nature, fixing atmospheric nitrogen, into ammonium ions.
Spirogyra is a free living filamentous green alga.

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