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

  

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

(a) Azotobactor 

(b) Anabaena 

(c) Nostoc 

(d) Spirogyra

This topic was modified 2 months ago by mohan dash
1 Answer
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The option is (d) Spirogyra 

Explanation:

Members of Kingdom Monera ­ bacteria and cyanobacteria (blue green algae) have the ability to fix nitrogen. Azotobacter is a N 2 ­fixing bacteria. Anabaena and Nostoc are heterocystous blue­green algae. The heterocysts are the sites of N 2 ­fixation. Spirogyra is one of the commonest green algae. It has no function in nitrogen fixation.

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