What Ecological Role Were the Nitrogen-Fixing Bradyrhizobium Japonicum Bacteria in Soybean

question 4

Multiple Choice

What ecological role were the nitrogen-fixing Bradyrhizobium japonicum bacteria in soybean root nodules effectively playing when the experimenters cut off gaseous nitrogen?

• A) cheater
• B) predator
• C) commensal
• D) symbiont

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