Biological Nitrogen Fixation (BNF) Is Inhibited by Oxygen

Multiple Choice

Biological nitrogen fixation (BNF) is inhibited by oxygen. Which of the following statements is NOT correct?

A) Nitrogen fixation is ubiquitous in soil and water.
B) Cyanobacteria are among the significant prokaryotic nitrogen fixers.
C) BNF was the major source of fixed N before the Industrial Revolution.
D) Only anaerobes fix dinitrogen on land.
E) A wide diversity of prokaryotes use same enzyme-nitrogenase for nitrogen fixation.