LIFE SCIENCE

Detailed explanation-1: -Nitrogen fixation is carried out naturally in soil by microorganisms termed diazotrophs that include bacteria, such as Azotobacter, and archaea. Some nitrogen-fixing bacteria have symbiotic relationships with plant groups, especially legumes.

Detailed explanation-2: -Bacteria in the soil fix the nitrogen. That means they combine it with oxygen or hydrogen into compounds that plants can make use of. Some nitrogen-fixing microbes have even developed a symbiotic relationship with certain plants–like peas and beans.