The diagram below outlines some stages in the nitrogen cycle - Leaving Cert Biology - Question 2 - 2021
Question 2
The diagram below outlines some stages in the nitrogen cycle.
The diagram includes the following elements:
- Atmospheric nitrogen
- Soil nitrates
- Pea plants
- An... show full transcript
Worked Solution & Example Answer:The diagram below outlines some stages in the nitrogen cycle - Leaving Cert Biology - Question 2 - 2021
Step 1
Why do organisms need nitrogen?
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Answer
Organisms need nitrogen to synthesize proteins and nucleic acids such as DNA and RNA. It is essential for the formation of amino acids, which are the building blocks of proteins, and for producing ATP or NAD(P) which are vital for energy transfer.
Step 2
Name the processes indicated at A and B in the diagram above.
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Answer
A: Nitrogen fixation
B: Denitrification
Step 3
Name the type of bacteria involved in the process indicated by C in the diagram above.
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Answer
C: Nitrifying bacteria (or correctly named bacteria)
Step 4
Two possible outcomes of this practice (application of fertilisers):
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Answer
More nitrification leading to increased nitrogen absorption by plants, resulting in enhanced growth.
Increased food supply for animals due to more plant growth, or potential water pollution through runoff.
Step 5
On the diagram, place the letter D on one location where decomposers act.
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Answer
Place the letter D on the arrow leading to soil ammonia from animals or from pea plants.
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