![Which of the following cannot fix nitrogen?](https://www.gkseries.com/blog/wp-content/uploads/2022/01/Which-of-the-following-cannot-fix-nitrogen.png)
Q. Which of the following cannot fix nitrogen?
A. Nostoc
B. Azotobacter
C. Spirogyra
D. Anabaena
Answer: Spirogyra
A. Nostoc
B. Azotobacter
C. Spirogyra
D. Anabaena
Answer: Spirogyra
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