Discussion
Pick the odd one out :
Answer: A
The odd one out is Agrobacterium - horseradish.
The other three pairs are nitrogen-fixing associations between a microbe and a plant: Anabaena fixes nitrogen inside the leaves of the fern Azolla, the actinomycete Frankia forms nitrogen-fixing nodules on the roots of alder, and Rhizobium forms nodules on the roots of peas and other legumes.
Agrobacterium does not fix nitrogen for its host. Agrobacterium tumefaciens is a plant pathogen that causes crown gall and A. rhizogenes causes hairy root, which is used to grow hairy root cultures of plants such as horseradish. That pairing is a pathogen or tool, not a nitrogen-fixing symbiosis.
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