Is it true that nitrogen-fixing bacteria are only found in legumes?

It is false that nitrogen-fixing bacteria are only found in legumes.

Nitrogen-fixing bacteria can be found in various plants, including legumes such as beans and peas, as well as other plants such as alder and cypress. These bacteria have a symbiotic relationship with the plants, where they convert atmospheric nitrogen into a form that the plant can use for growth. This allows plants to obtain nitrogen without relying on external sources, such as fertilizers. Therefore, nitrogen-fixing bacteria are essential for plant growth and play a crucial role in the ecosystem.