A) Erwinia amylovora
B) Rhizobium leguminosarum
C) Xanthomonas campestris
D) Agrobacterium tumefaciens
Correct Answer: B
Solution :
Rhizobium leguminosarum is a small, flagellate gram-negative, aerobic, rod- shaped bacteria. It persists saprophytically in the soil until it infects a root hair or damaged epidermal cell. After infection, Rhizobium establishes a symbiotic relationship with legumes living inside the root nodules and fixes large amount of nitrogen, much of which his made available to the plant.
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