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:
A) A only
B) D only
C) B only
D) E only
Explanation
[Solution by Claude - not from source] Azotobacter, Oscillatoria, Anabaena and Nostoc are nitrogen fixers; Volvox (green alga) is not. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.