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symbiotic relationship between rhizobium:The rhizobia are soil microorganisms that can interact with leguminous plants to form root nodules within which conditions are favourable for bacterial nitrogen fixation.Leghaemoglobin is a product of the symbiotic interaction,since the globin is produced by the plant while the haem is synthesised by the bacteria

symbiotic relation between algae and fungi:lichens are the symbiotic association between algae and fungi.The algal cell,through the process of photosynthesis,provide the fungus with some of the organic nutrients which it needs .