Question

Nitrogen-fixing bacteria like Rhizobium are associated primarily with which part of the nitrogen cycle?

• A. Denitrification
• B. Nitrification
• C. Nitrogen Fixation
• D. Ammonification

Answer 1

Answer:

C. Nitrogen Fixation

• Rhizobium, found in root nodules of legumes, fixes atmospheric nitrogen into ammonia, making it usable for plants—this step is nitrogen fixation.