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Frankia forms nitrogen-fixing nodules on

  • A.Cereal crops such as rice, wheat and barley
  • B.Members of the pea family and no other plants
  • C.Free-floating aquatic ferns such as Azolla and Salvinia
  • D.Non-legume woody plants such as Alnus and Casuarina

Answer: D

Frankia is an actinomycete that forms actinorhizal nodules on woody non-legumes including alder and casuarina, which is why those trees colonise poor soils so readily. Legume nodules are the work of Rhizobium, and the fern association is Anabaena inside Azolla.

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