Which of the following species does not have the ability to fix atmospheric nitrogen?

Azotobactor

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Anabaena

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Nostoc

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Spirogyra

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Solution

The correct option is D
Spirogyra

Some microbes have the ability to fix atmospheric nitrogen and convert it into a usable form that plants can make use of. These microbes are of two types, free-living and symbiotic. Nostoc, Anabaena, Azorobacter are free-living bacteria that fix nitrogen in the soil. Spirogyra on the other hand is type of a blue green algae that does not have the ability to fix atmospheric nitrogen.

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