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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. 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
Volvox is a green alga (chlorophyte) and cannot fix nitrogen.
Detailed Solution
Azotobacter, Oscillatoria, Anabaena, and Nostoc are diazotrophs (bacteria/cyanobacteria capable of nitrogen fixation). Volvox is a colonial green alga (eukaryote) that cannot fix atmospheric nitrogen.