Most nitrogen- fixing bacteria symbiotically associated with plants are called

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Rhizobia are the nitrogen-fixing bacteria that are symbiotically associated with plants, especially legumes like soybean, clover, and alfalfa. They form nodules on plant roots and convert atmospheric nitrogen into a form that plants can use for growth, and in return, the plant provides the bacteria with carbohydrates and other nutrients. Bacteroids are the specialized form that rhizobia assume inside the nodules, whereas symbiodinia are found in marine organisms and mycorrhizae are a type of fungus associated with plant roots.

Most Nitrogen- Fixing Bacteria Symbiotically Associated with Plants Are Called