rhizobium bacteria appear like pink, rod like. Explain
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Rhizobium can fix nitrogen only in conditions such as those prevailing in a root nodule. ... Root nodules may appear pink because they contain leghaemoglobin. This is the only haemoglobin found in plants. It absorbs oxygen and provides anaerobic conditions for bacteria in the root nodules.
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symbolic association with the host plant with root nodules of leguminous plants with independently fixination.
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