Discussion
Rhizobium bacteria are present in the _____ of leguminous plants.
Answer: A
Correct answer: Roots
Rhizobium lives in nodules on the roots of legumes - peas, beans, gram, groundnut. The nodule is a structure the plant builds around the bacteria, and its pink colour comes from leghaemoglobin, which keeps oxygen away from the nitrogenase that oxygen would destroy.
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