alleryThe genus of bacteria forming symbiotic root nodules in LEGUMES is:
AAzotobacter (free-living, aerobic)
BClostridium (free-living, anaerobic)
CRhizobium (symbiotic in legume nodules)
DNitrosomonas (does nitrification only)
Answer & Solution
Correct answer: C. Rhizobium (symbiotic in legume nodules)
RHIZOBIUM forms root nodules in legumes (pea, gram, soybean, alfalfa).
**Inside nodules:** bacteria become bacteroids
leghaemoglobin (pink) keeps O₂ low.
Plant gives sugars; bacteria give fixed N.
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