Biology · PYQ NEET UG 2025
हिन्दीWhich of following organisms cannot fix nitrogen? A. Azotobacter B. Oscillatoria C. Anabaena D. Volvox E. Nostoc Choose the correct answer from the options given below:
Correct answer · Option 2
D only
Explanation
Volvox is a green alga that lacks the ability to fix atmospheric nitrogen, whereas Azotobacter, Oscillatoria, Anabaena, and Nostoc are known nitrogen fixers.