Discussion
Which of these fixes nitrogen while living free in the soil rather than in a nodule?
Answer: C
Azotobacter is a free-living aerobic fixer needing no plant partner, as are Azospirillum and Clostridium. Rhizobium and Bradyrhizobium nodulate legumes and Frankia nodulates non-legume trees, so all three of those depend on a host.
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