Symbiosis

Example of a symbiotic relationship:

• Leguminous plants and rhizobia - Although leguminous plants cannot utilize the nitrogen from the air, the bacteria rhizobia can convert nitrogen from the air into useful compounds through nitrogen-fixing. The bacteria are found in the soil and can be grown in a culture, but will not fix nitrogen. Once they have infected a plant, the plant forms nodules on the roots, where the bacteria grow and nitrogen fixation occurs.

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