AP BIOLOGY

Detailed explanation-1: -Nitrogen-fixing bacteria in the soil and within the root nodules of some plants convert nitrogen gas in the atmosphere to ammonia. Nitrifying bacteria convert ammonia to nitrites or nitrates. Ammonia, nitrites, and nitrates are all fixed nitrogen and can be absorbed by plants.

Detailed explanation-2: -Examples of this type of nitrogen-fixing bacteria include species of Azotobacter, Bacillus, Clostridium, and Klebsiella.

Detailed explanation-3: -Bacteria such as Rhizobium and certain blue-green algae can fix atmospheric nitrogen in the soil.

Detailed explanation-4: -Nitrogen-fixing bacteria are prokaryotic microorganisms that are capable of transforming nitrogen gas from the atmosphere into “fixed nitrogen” compounds, such as ammonia, that are usable by plants.

Detailed explanation-5: -And the bacteria essentially take up residence in the roots of these plants. GAULTON: These bacteria are incorporated into root nodules and in these special protective houses, bacteria work anaerobically to fix nitrogen into ammonia, using a special enzyme called nitrogenous–which combines hydrogen and nitrogen.