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

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

AIPMTAIPMT 1994Microbes in Human Welfare

Solution:

Members of kingdom monera - bacteria and cyanobacteria (blue green algae) have the ability to fix nitrogen. Azotobacter is a N2-fixing bacteria. Anabaena and Nostoc are heterocystous blue-green algae. The heterocysts are the sites of N2-fixation. Spirogyra is one of the commonest green algae. It has no function in nitrogen fixation.