MCQ
Which of the following organisms not fix atmospheric nitrogen?
- AOscillatoria
- BNostoc
- CSpirogyra
- DAnabaena
✓
Answer
Spirogyra
Explanation: Spirogyra is a filamentous alga. This alga does not fix atmospheric nitrogen. Anabaena, Nostoc, and Oscillatoria can heterocyst that can fix atmospheric nitrogen.
Explanation: Spirogyra is a filamentous alga. This alga does not fix atmospheric nitrogen. Anabaena, Nostoc, and Oscillatoria can heterocyst that can fix atmospheric nitrogen.
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