Question

All of the following statements concerning the Actinomycetes, filamentous soil bacterium Frankia are correct EXCEPT that Frankia

• A. Forms specialized vesicles in which the nitrogenase is protected from oxygen by chemical barrier involving triterpene hopanoids
• B. Can induce root nodules on many plant species
• C. Like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host's cortex
• D. Cannot fix nitrogen in the free-living state

Answer 1

The correct option is D

Cannot fix nitrogen in the free-living state

Frankia is a nitrogen fixing symbiotic bacteria belonging to the group of actinomycetes. It induces root nodules just like Rhizobium. It is associated symbiotically with the root nodules of several non-legume plants like Casuarina, Alnus, and Rubtis etc. It cannot fix nitrogen in Free State.