Which of the Following Organisms Forms a Specific Mutualistic Association

Question

Which of the following organisms forms a specific mutualistic association with legumes?
A) rhizobia
B) agrobacteria
C) E. coli
D) morels
E) Vibrio sp.

Accepted Answer

Rhizobia forms a specific mutualistic association with legumes, in which the bacteria fix nitrogen in nodules on the roots of the plant, allowing the plant to use this essential nutrient for growth. Agrobacteria are plant pathogens, E. coli is a normal inhabitant of the gut, morels are fungi, and Vibrio sp. are bacteria associated with marine environments.