Which one does not fix nitrogen?

Azotobacter

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Spirogyra

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Anabaena

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Nostoc

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Solution

The correct option is B Spirogyra
Azotobacter, Anabaena, Nostoc are the nitrogen fixing prokaryotes in lichens, azolla, Cycas while Spirogyra is a green algae which does photosynthesis. It does not fix nitrogen.
Hence, the correct option is B.

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