13.2 - Carbon and Nitrogen Cycles

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Carbon Cycle
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Carbon Cycle
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What roles do photosynthesis and cellular respiration play in the carbon cycle?
They absorb and release carbon. Photosynthesis takes in Co2 and respiration releases it.
What are some sources of carbon in the carbon cycle?
Sources of carbon include fossil fuels, cellular respiration, plant degradation, and forest fires.
What are some sinks (places where carbon is stored) in the carbon cycle?
Carbon sinks include the ocean, plants, and soil.
What role does energy play in the carbon cycle? (Think about the ways living organisms use carbon in its different forms.)
Energy and carbon travel through cycles together, such as when an animal eats a plant to get energy. The plant also has carbon, and that is absorbed along with the energy. When a bigger animal eats the smaller one, that animal gains the energy and continues to exhale carbon.
What can humans do to increase the capacity of carbon sinks and decrease the amount of carbon being added to the atmosphere as part of the carbon cycle?
Stop using so much fossil fuels!! We need to conserve and start using renewable energy, such as windmills and solar panels. We also need to lower our carbon footprint by not driving as much, conserving forests, and planting more trees.
Nitrogen Cycle
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Identify the reservoirs or sinks where nitrogen is stored in the nitrogen cycle.
Nitrogen can also be found in bodies of water, soil, the atmosphere, and living things.
Explain the different processes that move nitrogen through the different sinks or reservoirs.
Nitrogen moves from the atmosphere to the soil, where it can be used by plants.
What are the only ways nitrogen can move from the atmosphere to the soil?
Nitrogen Fixation and Nitrification.
Carbon makes up about 20% of our bodies, whereas nitrogen makes up less than 4%. Why is the nitrogen cycle still vital for the survival of all living things?Nitrogen is a crucially important component for all life, it's an important part of many cells and processes such as amino acids, proteins and even our DNA.Plants play an important role in the carbon cycle because they take carbon dioxide from the atmosphere. That carbon is used to create organic molecules that are consumed by animals, which helps drive the carbon cycle. Based on the diagram, what organism(s) play an important role in the nitrogen cycle?Decomposers, because they put nitrogen back in the environment.