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Describe, with the aid of a labelled diagram, the carbon cycle. - Leaving Cert Agricultural Science - Question a - 2009
Question a
Describe, with the aid of a labelled diagram, the carbon cycle.
Worked Solution & Example Answer:Describe, with the aid of a labelled diagram, the carbon cycle. - Leaving Cert Agricultural Science - Question a - 2009
Step 1
Describe the carbon cycle
Answer
The carbon cycle is a natural process by which carbon is exchanged among various environmental reservoirs, including the atmosphere, oceans, soil, and living organisms. This cycle includes several key processes:
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Photosynthesis: Plants absorb carbon dioxide from the atmosphere during photosynthesis, converting it into organic matter (biomolecules) which helps in their growth.
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Respiration: Animals consume plants for energy and release carbon dioxide back into the atmosphere through respiration.
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Decomposition: When organisms die, decomposers break down their organic matter, returning carbon to the soil and releasing carbon dioxide into the atmosphere.
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Combustion: When fossil fuels are burnt, carbon stored in these fuels is released back into the atmosphere as carbon dioxide, contributing to the greenhouse gas effect.
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Ocean Uptake: Oceans also absorb a significant amount of carbon dioxide, which can be utilized by marine organisms and contribute to the formation of carbonates.
In summary, the carbon cycle is essential for maintaining the balance of carbon in our environment, and human activities such as deforestation and fossil fuel combustion have greatly impacted this natural process.
Step 2
Labelled diagram
Answer
To illustrate the carbon cycle, a labelled diagram can be utilized, which should include the following elements:
- Photosynthesis: Indicate that plants absorb carbon dioxide from the air.
- Respiration: Show animals consuming plants and returning carbon dioxide to the atmosphere.
- Decomposition: Depict the breakdown of dead organisms by microorganisms, releasing carbon back into the soil and air.
- Combustion: Represent the burning of fossil fuels, leading to carbon dioxide emissions.
- Ocean uptake: Indicate the interaction between ocean water and atmospheric carbon.
- Arrows should show the flow of carbon between these processes. Each of these processes should be clearly labeled in the diagram to reflect their roles in the carbon cycle.