A) Azorhizobium
B) Bradyrhizobium
C) Sinorhizobium
D) Mesorhizobium
Correct Answer: B
Solution :
Glydne max (soybean) plant is inoculated with Bradyrhizobium japonicum. Bradyrhizobium species are a common soil dwelling microorganism that can form symbiotic relationships with leguminous plant species where they fix nitrogen in exchange for carbohydrates from the plant. Like other rhizobia, they have the ability to fix atmospheric nitrogen into forms readily available for other organisms to use. They are slow growing in contrast to Rhizobium species, which are considered fast growing rhizobia. In a liquid media broth, it takes Bradyrhizobium species 3-5 days to create a moderate turbidity and 6-8 hours to double in population size. They tend to grow best with pentoses as a carbon source.
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