A) Azospirillum
B) Rhizobium
C) Nostoc
D) Azotobacter
Correct Answer: B
Solution :
Khizobium leguminosarum is a symbiotic' bacteria found in root nodules of legume. This bacterium has nitrogen fix nif gene and fixing \[{{N}_{2}}\]. Soyabean is a legume. Thus, Rhizobium is used as a biofertilizer for raising soyabean crop.
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