Botany · Biological Classification

NEET (UG) 2025 — Question 106

Which 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:

Answer: B

Nitrogen fixation is the ability to convert atmospheric N₂ into ammonia, possessed by certain bacteria. Volvox is

a green algae that cannot fix nitrogen, unlike the bacterial organisms listed.

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