What occurs during nitrification?

Answer 1

Step 1: Nitrogen-fixation

Atmospheric: Happens when Nitrogen (N2) is oxidized at high temperatures (by lightning, in internal combustion engines) to make nitrite (NO2). This can combine with water to form nitric acid (H2NO3), which is deposited on earth through rainfall.

Biological: Done by bacteria which can convert N2 into ammonia (NH3) if an energy source is present. Some get this energy by directly absorbing sunlight (blue-green algae) or by living in the roots of plants (legumes, alder trees), who provide them with food (Rhizobium, Azospirillium).

Step 2: Conversion to Ammonia. As amino acids and nucleic acids require N in the form of Ammonia, if nitrate (NO3) present, it must be converted to NH3. This is done through Nitrate reductase enzymes.

Step 3: Biological Use. Ammonia is incorporated into proteins, nucleic acids

Step 4: When organism dies, ammonia is relased back into the biosphere through the process of Ammonification, in which water is added to proteins to make carbon dioxide and ammonia. This process happens during digestion, and is also done by bacterial and fungal decomposers.

Step 5: If ammonia released into oxygen rich (anerobic) soil, other bacteria can convert it into nitrite or nitrate through the process of Nitrification:

NH4+ + 2O2 = NO3- + H2O + 2H.

This is a problem, as it gives the molecule which contains Nitrogen a negative charge, which repels it from soil particles, causing it to be easily leached into streams and groundwater.

Step 6: If soils remain anerobic, another group of poop will convert it back into inert, atmospheric N2 through the process of Denitrification. In this process, bacteria use nitrate as an Oxygen source for respiration: C6H12O6 + 4NO3- = 6CO2 + 6H2O + 2N2

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Answer 2

Type you

Nitrogen molecules are split apart.

Nitrogen moves from soil to plant material.

Dead animals decompose.

Gaseous nitrogen is released.

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Answer 3

The Nitrogen Cycle

1.Nitrogen gas in the atmosphere is captured by Nitrogen-fixing bacteria in the soil and in the root nodules of legumes. This Nitrogen is converted to Ammonium by the bacteria.

2. Nitrifying Bacteria convert the Ammonium into Nitrites and Nitrates.

3. Denitrifying Bacteria convert both Ammonium and Nitrates back into atmospheric Nitrogen.

Answer 4

1.Nitrogen molecules are split apart.

2.Nitrogen moves from solid to plant material.

3.Dead animals decompose.

4.Gaseous nitrogen is released.

Answer 5

Ammonia → nitrite → nitrate

Answer 6

The process by which nitrites and nitrates are produced by bacteria in the soil

Answer 7

Nitrification is the oxidation of ammonia (release during ammonification) into nitrate state. Nitrification is performed b two types of bacteria 1) Nitrite bacteria 2) Nitrate bacteria.