EVERYDAY SCIENCE

Detailed explanation-1: -Root nodules are the site of nitrogen fixation in leguminous plants. So, nitrogen fixing bacteria are most likely to be found in root nodules of these plants.

Detailed explanation-2: -In legumes and a few other plants, the bacteria live in small growths on the roots called nodules. Within these nodules, nitrogen fixation is done by the bacteria, and the NH3 they produce is absorbed by the plant.

Detailed explanation-3: -Rhizobium attaches to the roots of the leguminous plants resulting in the generation of root nodules. It forms a symbiotic association with the leguminous plants as it draws the nutrition from the plants and in turn helps with the fixation of nitrogen in the soil for the leguminous plants to take up.

Detailed explanation-4: -Nitrogen fixation occurs in the root nodules that contain bacteria ( Bradyrhizobium for soybean, Rhizobium for most other legumes). Almost all legumes can fix nitrogen.

Detailed explanation-5: -Nitrification. Nitrification is the process that converts ammonia to nitrite and then to nitrate and is another important step in the global nitrogen cycle. Most nitrification occurs aerobically and is carried out exclusively by prokaryotes.