Biogeochemical Cycle Assessment

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What is the phosphorus cycle?

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The phosphorus cycle is the biogeochemical cycle that describes the movement of phosphorus through the lithosphere, hydrosphere, and biosphere. It involves processes such as weathering, absorption by plants, and return to the soil through decomposition.

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What role does phosphorus play in living organisms?

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Phosphorus is essential for life as it is a key component of ATP (adenosine triphosphate), which stores and transfers energy in cells, and is also a part of DNA and RNA, which are crucial for genetic information.

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What are phosphate ions?

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Phosphate ions (PO4)3- are negatively charged ions that contain phosphorus and oxygen. They are vital for plant growth and are often found in fertilizers.

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How do plants absorb phosphorus?

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Plants absorb phosphorus in the form of phosphate ions from the soil through their roots.

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What is the significance of decomposition in the nitrogen cycle?

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Decomposition is crucial in the nitrogen cycle as it breaks down organic matter, releasing nitrogen back into the soil in forms that can be used by plants.

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What organisms are responsible for nitrogen fixation?

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Bacteria, particularly those in the root nodules of legumes, are responsible for nitrogen fixation, converting atmospheric nitrogen (N2) into ammonia (NH3) that plants can use.

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What is humus?

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Humus is the dark organic material in soil formed from the decay of plant and animal matter. It enriches the soil with nutrients and improves its structure.

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What is the process of photosynthesis?

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Photosynthesis is the process by which green plants use sunlight to convert carbon dioxide (CO2) and water into glucose and oxygen, thus removing CO2 from the atmosphere.

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What is respiration in the context of the carbon cycle?

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Respiration is the process by which living organisms convert glucose and oxygen into energy, releasing carbon dioxide (CO2) back into the atmosphere.

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What is the role of bacteria in the nitrogen cycle?

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Bacteria play several roles in the nitrogen cycle, including nitrogen fixation, nitrification, and denitrification, helping to convert nitrogen into forms usable by plants.