LIFE SCIENCE

Detailed explanation-1: -The steps, which are not altogether sequential, fall into the following classifications: nitrogen fixation, nitrogen assimilation, ammonification, nitrification, and denitrification.

Detailed explanation-2: -In the fifth stage of the nitrogen cycle, nitrogen returns to the air as nitrates are converted to atmospheric nitrogen (N2) by bacteria through the process we call denitrification.

Detailed explanation-3: -Four processes participate in the cycling of nitrogen through the biosphere: (1) nitrogen fixation, (2) decay, (3) nitrification, and (4) denitrification. Microorganisms play major roles in all four of these.

Detailed explanation-4: -The order of the nitrogen cycle is nitrogen fixation, assimilation, ammonification, nitrification, and denitrification. 6. What is the first step in the nitrogen cycle? The first step in the nitrogen cycle is nitrogen fixation carried out in the soil in the absence of oxygen by soil bacteria and cyanobacteria.