Multiple choice general knowledge

The bacteria responsible for fixing nitrogen in Soyabean is :

  1. Rhizobium leguminorserum

  2. Rhizobium japonicum

  3. Rhizobium phaseoli

  4. Rhizobium trifolii
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B Correct answer
Explanation

Rhizobium japonicum is the specific nitrogen-fixing bacteria that forms symbiotic nodules on soybean roots. Different Rhizobium species are host-specific: R. leguminosarum infects peas, R. phaseoli infects beans, and R. trifolii infects clover.

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