All of the following statements concerning the Actinomycetes filamentous soil bacteria Frankia are correct except the Frankia-

Options

A. can induce root nodules on many plant species
B. cannot fix nitrogen in the free-living state
C. like Rhizobium, it usually infects, its host plant through root hair deformation and stimulates cell proliferation in the host's cortex
D. forms specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpenoids

Answer

B