Which of the following does not fix atmospheric nitrogen

Options :
  1. Nostoc
  2. Anabaena
  3. Spyrogyra
  4. Azotobacter
Answer and Explanation :-

Answer: Option 3

Explanation:

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By degrees, however, they began to hope again. Such are our insubmergable mirages of the soul! There is no distress so complete but that even in the most critical moments the inexplicable sunrise of hope is seen in its depths.
-Victor Hugo The Man Who Laughs