A) Rhizobiurn
B) Azotobactor
C) Clostridium
D) Streptomyces
Correct Answer: A
Solution :
Rhizobium is the bacterium which live in the root nodules of leguminous plants m symbiotic form. It fixes the atmospheric \[{{N}_{2}}\] into nitrate as to make soil \[{{N}_{2}}\]rich. Plants can utilize only soil nitrogen in the form of nitrates or nitrites.
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