Biogeochemical Cycles

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What is denitrification?

Back

Denitrification is the process by which bacteria convert nitrates (NO3-) and nitrites (NO2-) into nitrogen gas (N2), returning it to the atmosphere.

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Who carries out each process in the nitrogen cycle?

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Each process in the nitrogen cycle is carried out by bacteria.

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Can plants take in nitrogen directly from the air?

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FALSE. Plants cannot take in nitrogen directly from the air; they absorb it in the form of nitrates or ammonium from the soil.

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What is transpiration?

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Transpiration is the process of evaporation of water from the surfaces of plants, primarily through small openings called stomata.

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How do biogeochemical cycles sustain life?

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Biogeochemical cycles sustain life by recycling essential nutrients, such as nitrogen, which is converted from waste into usable forms for organisms.

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Front

What is the nitrogen cycle?

Back

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

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What role do bacteria play in the nitrogen cycle?

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Bacteria play crucial roles in the nitrogen cycle, including nitrogen fixation, nitrification, and denitrification.

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What is nitrogen fixation?

Back

Nitrogen fixation is the process by which atmospheric nitrogen (N2) is converted into ammonia (NH3) by certain bacteria, making it available for plants.

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What is nitrification?

Back

Nitrification is the process by which ammonia (NH3) is converted into nitrites (NO2-) and then into nitrates (NO3-) by bacteria.

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What is the significance of the carbon cycle?

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The carbon cycle is significant because it regulates the levels of carbon dioxide in the atmosphere, which is essential for photosynthesis and climate regulation.

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