AP BIOLOGY

Detailed explanation-1: -nitrogen fixation, any natural or industrial process that causes free nitrogen (N2), which is a relatively inert gas plentiful in air, to combine chemically with other elements to form more-reactive nitrogen compounds such as ammonia, nitrates, or nitrites.

Detailed explanation-2: -The process of combining nitrogen with other elements in order to make usable compounds is called nitrogen fixation. Most nitrogen is transformed into usable nitrogen compounds by nitrogen-fixing bacteria. Some nitrogen-fixing bacteria live in special swelling on the roots of legume plants.

Detailed explanation-3: -Nitrogen fixation is the processes by which atmospheric N2 is converted to any N compound where N has a nonzero oxidation state. Historically, the most common process has been the biologically driven reduction of N2 to NH3 or NH4+.

Detailed explanation-4: -Nitrogen fixation is a chemical process that converts atmospheric nitrogen into ammonia, which is absorbed by organisms. Nitrogen fixation is essentially converting atmospheric nitrogen into a form that plants can more readily utilize.

Detailed explanation-5: -Nitrogen Cycle is a biogeochemical process through which nitrogen is converted into many forms, consecutively passing from the atmosphere to the soil to organism and back into the atmosphere. It involves several processes such as nitrogen fixation, nitrification, denitrification, decay and putrefaction.