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BotanyNEET 2025Monera, Protista and Fungi

Biological Classification

Which of the following organisms cannot fix nitrogen?

A. Azotobacter · B. Oscillatoria · C. Anabaena · D. Volvox · E. Nostoc

Choose the correct answer from the options given below:

  1. A.A only
  2. B.D only
  3. C.B only
  4. D.E only

Solution

Volvox is a green alga with no nitrogen-fixing ability. Azotobacter is a free-living fixer, and Oscillatoria, Anabaena and Nostoc are nitrogen-fixing cyanobacteria.

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