Fundamentholfundamenthol
NEET2025Biology
Q.

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:

  1. A

    E only

  2. B

    A only

  3. C

    D only

  4. D

    B only

Solution

Azotobacter (free-living bacterium) and the cyanobacteria Oscillatoria, Anabaena and Nostoc are all well-known nitrogen fixers.

Volvox, however, is a colonial green alga (chlorophyte) and cannot fix nitrogen.

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