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Many legumes have root nodules that provide a home for symbiotic nitrogen-fixing bacteria called rhizobia. This relationship is particularly common in nitrogen-limited conditions. The Rhizobia convert nitrogen gas from the atmosphere into ammonia, which is then used in the formation of amino acids and nucleotides .
Symbiosis in lichens is the mutually helpful symbiotic relationship of green algae and/or blue-green algae (cyanobacteria) living among filaments of a fungus.The fungus benefits from the algae or cyanobacteria because they produce food by photosynthesis.he lichen combination of fungus and/or algae and/or cyanobacteria has a very different form (morphology), physiology, and biochemistry than the parts growing by themselves. The properties of the whole combination are very different from the sum of the properties of the parts living by themselves.