Which of the following species does not have the ability to fix atmospheric nitrogen?
Correct answer: D. Spirogyra
- A. Azotobacter
- B. Anabaena
- C. Nostoc
- D. Spirogyra
Explanation
Members of Kingdom Monera - bacteria and cyanobacteria (blue-green algae)- have the ability to fix nitrogen. Azotobacter is an 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.
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