Cyanobacteria are / Nostoc is

Oxygenic with nitrogenase

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Oxygenic without nitrogenase

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Non- Oxygenic with nitrogenase

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Non - Oxygenic without nitrogenase

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Solution

The correct option is C Oxygenic with nitrogenase
The cyanobacteria fix atmospheric nitrogen through the help of enzyme nitrogenase and are oxygenic photosynthetic also.
So, the correct option is 'Oxygenic with nitrogenase'.

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