Carbon and Nitrogen Cycles

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What is the carbon cycle?

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The carbon cycle is the process by which carbon is exchanged among the atmosphere, land, water, and living organisms. It involves processes like photosynthesis, respiration, decomposition, and combustion.

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What is the nitrogen cycle?

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The nitrogen cycle is the series of processes by which nitrogen and its compounds are interconverted in the environment and in living organisms, including nitrogen fixation, nitrification, and denitrification.

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Define ammonification.

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Ammonification is the process by which bacteria convert organic nitrogen from dead organisms and waste into ammonia, making it available for plants.

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What is nitrification?

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Nitrification is the process by which ammonia is converted into nitrites and then into nitrates by bacteria, making nitrogen available to plants.

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What is denitrification?

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Denitrification is the process by which bacteria convert nitrates back into nitrogen gas, returning it to the atmosphere.

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What role do heterotrophs play in the nitrogen cycle?

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Heterotrophs obtain nitrogen by consuming plants or other organisms, which is essential for building proteins.

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How do plants absorb nitrogen?

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Plants absorb nitrogen primarily in the form of nitrates from the soil, which they use to synthesize proteins and nucleic acids.

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What is the significance of photosynthesis in the carbon cycle?

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Photosynthesis is the process by which plants convert carbon dioxide from the atmosphere into organic compounds, releasing oxygen as a byproduct.

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How does combustion affect the carbon cycle?

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Combustion releases carbon dioxide into the atmosphere by burning fossil fuels and biomass, contributing to greenhouse gas emissions.

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What is assimilation in the context of the nitrogen cycle?

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Assimilation is the process by which plants and animals incorporate nitrogen from the soil or food into their own biological molecules.