Verified answer

The Nitrogen Cycle

Answer:

A. Atmosphere and Biosphere

Explanation:

Bacteria and algae convert nitrogen from the air into a form that is usable by plants and animals and this is called the Nitrogen cycle. Nitrates can be used by plants and animals that consume the plants. Some bacteria in the soil can turn ammonia into nitrites. Although nitrite is not usable by plants and animals directly, other bacteria can change nitrites into nitrates—a form that is usable by plants and animals.

Here are the stages of the Nitrogen Cycle.

Stage 1. Nitrogen Fixation

• nitrogen moves from the atmosphere into the soil. o be used by plants, the N2 must be transformed through a process called nitrogen fixation. Fixation converts nitrogen in the atmosphere into forms that plants can absorb through their root systems.

Stage 2. Mineralization

• Nitrogen moves from organic materials, such as manure or plant materials to an inorganic form of nitrogen that plants can use. Mineralization happens when microbes act on organic material, such as animal manure or decomposing plant or animal material, and begin to convert it to a form of nitrogen that can be used by plants.

Stage 3. Nitrification

• The ammonia in the soils, produced during mineralization, is converted into compounds called nitrites. Some bacteria in the soil can turn ammonia into nitrites.

Stage 4. Immobilization

• Soil microorganisms pull nitrogen from the soil when the residues of decomposing plants do not contain enough nitrogen. When microorganisms take in ammonium (NH4+) and nitrate (NO3−), these forms of nitrogen are no longer available to the plants and may cause nitrogen deficiency, or a lack of nitrogen.

Stage 5. Denitrification

• Nitrogen returns to the air as nitrates are converted to atmospheric nitrogen (N2) by bacteria through the process we call denitrification.

To know the importance of nitrogen, please head over to this link brainly.ph/question/240790.

#BrainlyEveryday

Answer:

A

Explanation:

I'm not sure but i hope it's help