The symbiotic relationship between soil bacteria, collectively known as rhizobia (which includes the genera Rhizobium, Bradyrhizobium, Mesorhizobium, and Sinorhizobium), and legume roots, generates nodules (a new differentiated organ), which fix atmospheric di-nitrogen (N2) through the action of the nitrogenase enzyme .
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Answer:
C. also known as rhizobia
Explanation:
The symbiotic relationship between soil bacteria, collectively known as rhizobia (which includes the genera Rhizobium, Bradyrhizobium, Mesorhizobium, and Sinorhizobium), and legume roots, generates nodules (a new differentiated organ), which fix atmospheric di-nitrogen (N2) through the action of the nitrogenase enzyme .