All of the following statements concerning the actinomycetous filamentous soil bacterium Frankia are correct except that Frankia (a) can induce root nodules on many plant species (b) can fix nitrogen in the freeliving state (c) cannot fix specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hopanoids (d) like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host’s cortex.
Option B Frankia, is a nitrogen fixing symbiotic bacteria. It induces root nodules just like Rhizobium. It is associated symbiotically with the root nodules of several nonlegume plants like Casuarina, Alnus, Rubus etc. It cannot fix nitrogen in free state.
