Discussion
The root nodules of Casuarina which are capable of symbiotic nitrogen fixation contain the microbe
Answer: B
The microbe is Frankia.
Frankia is a filamentous actinomycete that forms nitrogen-fixing root nodules on non-leguminous plants such as Casuarina and Alnus (alder); such plants are called actinorhizal plants.
Rhizobium forms nodules on legumes such as peas and beans. Anabaena is a cyanobacterium that fixes nitrogen in water and in association with the fern Azolla, and Azotobacter is a free-living soil bacterium that fixes nitrogen without forming nodules.
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