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a
Rhizobium enriches the soil with nitrogen when occurs freely in the soil.
b
Azotobacter enriches the soil with nitrogen by fixing nitrogen.
c
Glomus is a nitrogen fixer.
d
Azospirillum forms root nodules in Fabaceae members.
answer is B.
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Detailed Solution
Rhizobium can not fix nitrogen when occurs freely in the soil It fixes nitrogen when associated with roots of Fabaceae members. Glomus is not a nitrogen fixer. Azospirillum does not form root nodules in Fabaceae members.