What do nitogen-fixing bacteria do?

Answer 1

Nitrogen fixing bacteria change nitrogen from the air into nitrogen compounds such as ammonia, nitrate, and nitrogen dioxide. They do so, through two living arrangements. One's as free living bacteria in the soil. The other's in association with plants of the Fabaceae and Leguminosae families, such as beans and peas. In this arrangement, the plant gives the bacteria sugars in the form of exudates [waste products]. In return, the bacteria provides the plant with nitrogen in forms that the plant can take in.