8E: Exploring Carbon and Nitrogen Cycles

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What is the carbon cycle?

Back

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

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What role do plants play in the carbon cycle?

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Plants absorb carbon dioxide from the atmosphere during photosynthesis, converting it into organic matter, which is essential for their growth and for the food chain.

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What is nitrogen fixation?

Back

Nitrogen fixation is the process by which nitrogen gas (N_2) is converted into ammonia (NH_3) by certain bacteria, making nitrogen available for plants.

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What is nitrification?

Back

Nitrification is the process in the nitrogen cycle where ammonia (NH_3) is converted into nitrites (NO_2-) and then into nitrates (NO_3-) by bacteria.

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What is denitrification?

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Denitrification is the process by which nitrates (NO_3-) are converted back into nitrogen gas (N_2) by bacteria, returning nitrogen to the atmosphere.

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What is the significance of decomposition in the carbon cycle?

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Decomposition breaks down dead organic matter, releasing carbon back into the atmosphere as carbon dioxide and returning nutrients to the soil.

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How does deforestation affect the carbon cycle?

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Deforestation increases the amount of carbon dioxide in the atmosphere because fewer trees are available to absorb CO2 during photosynthesis.

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What is the role of bacteria in the nitrogen cycle?

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Bacteria play crucial roles in the nitrogen cycle, including nitrogen fixation, nitrification, and denitrification, facilitating the conversion of nitrogen into forms usable by plants.

Front

What is photosynthesis?

Back

Photosynthesis is the process by which green plants use sunlight to convert carbon dioxide and water into glucose and oxygen, playing a key role in the carbon cycle.

Front

What are the main components of the nitrogen cycle?

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The main components of the nitrogen cycle include nitrogen fixation, nitrification, ammonification, and denitrification.