"Symbiosis is an association of two different kinds of organisms in which
each is beneficial to the other and indeed may be essential to the life
of the other."
Example of a symbiotic relationship:
- Leguminous plants and rhizobia - Although leguminous plants cannot
the nitrogen from the air, the bacteria rhizobia can convert nitrogen
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
the roots, where the bacteria grow and nitrogen fixation occurs.
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