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Title: The Nitrogen Cycle and its purpose in organisms
Description: • need for nitrogen in living organisms • processes involved in the nitrogen cycle
Description: • need for nitrogen in living organisms • processes involved in the nitrogen cycle
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Describe the need for nitrogen in living organisms (3)
Describe the processes involved in the nitrogen cycle (7)
Nitrogen is needed in plants as they absorb the organic nitrogen through their
roots to make amino acids and nucleic acids
...
The excess nitrogen is
deaminated and excreted as urea
...
This process is called nitrogen fixation and is done by living
organisms in the soil
...
g
...
This is also done by azotobacteria, which is free living in the soil and is able
to fix atmospheric nitrogen and convert it into ammonia
...
When an organism dies the proteins in its cells
are broken down into animo acids by decomposers (bacteria and fungi)
...
In
animals, ammonia is excreted in urine
...
The process occurs aerobically and so
is therefore only possible in well aerated soils
...
g
...
The second step of oxidation is
nitrites into nitrates by nitrobacter
...
Nitrates are converted back into
atmospheric nitrogen by anaerobic bacteria
Title: The Nitrogen Cycle and its purpose in organisms
Description: • need for nitrogen in living organisms • processes involved in the nitrogen cycle
Description: • need for nitrogen in living organisms • processes involved in the nitrogen cycle