Why do plants form symbioses with nitrogen-fixing bacteria?

Plants form symbiOSes with nitrogen-fixing bacteria primarily to enhance their nitrogen availability in the soil. These bacteria, often found in root nodules of legumes, convert atmospheric nitrogen into a form that plants can use for growth, thereby improving their nutrient uptake. This mutualistic relationship benefits both parties: the bacteria receive carbohydrates and a conducive environment for growth from the plants, while the plants gain access to essential nutrients that support their development. Overall, this symbiOSis increases plant productivity and soil fertility.