Q.

An organism as used as a bio fertilizers for raising the soya bean crop

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a

Nostoc

b

Azotobacter

c

Rhizobium

d

Azospirillum

answer is C.

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Detailed Solution

Rhizobium leguminosarum is a symbiotic bacteria found in root nodules of legumes this bacteria has nitrogen fixing gene (nif gene) and fixes N2 it is used as biofertilizer for raising soya bean crop.

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