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An organism used as a biofertilizer for raising soyabean crops is

1. Azotobacter
2. Azospirillum
3. Rhizobium
4. Nostoc

Correct answer: Rhizobium

Solution

Rhizobium is the classic biofertilizer for leguminous crops like soybean because it forms root nodules and fixes atmospheric nitrogen for the plant. The other options are either free-living or associated with non-legume systems.

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