Multiple choice

Which of the following is a nitrogen fixing bacterium present in legume roots?

  1. Azotobacter

  2. Rhizobium

  3. Nitrobacter

  4. Nitrosomonas
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B Correct answer
Explanation

Rhizobium forms a symbiotic relationship with legume roots, converting atmospheric nitrogen into ammonia through nitrogen fixation. This occurs in specialized root structures called nodules. Azotobacter is a free-living nitrogen fixer, while Nitrobacter and Nitrosomonas are involved in nitrification, not nitrogen fixation.

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