Nitrogen Cycle

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What is the nitrogen cycle?

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The nitrogen cycle is the process by which nitrogen is converted between its various chemical forms, including atmospheric nitrogen (N2), ammonia (NH3), nitrites (NO2-), and nitrates (NO3-), through biological and physical processes.

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What is denitrification?

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Denitrification is the process by which bacteria convert nitrates (NO3-) back into nitrogen gas (N2), releasing it into the atmosphere.

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What is nitrogen fixation?

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Nitrogen fixation is the process of converting atmospheric nitrogen (N2) into a form that plants can use, such as ammonia (NH3), often facilitated by bacteria.

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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 (converting ammonia to nitrates), and denitrification.

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What is the formula for atmospheric nitrogen?

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N2

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Can plants and animals use nitrogen directly from the air?

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No, plants and animals cannot use nitrogen directly from the air; they need it in a fixed form.

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What is ammonification?

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Ammonification is the process by which decomposers break down dead organic matter, releasing ammonia (NH3) into the soil.

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What is nitrification?

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

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How do lightning strikes contribute to the nitrogen cycle?

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Lightning strikes can convert atmospheric nitrogen (N2) into nitrates (NO3-) through high-energy reactions, which then fall to the ground with rain.

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What is the significance of nitrates in the nitrogen cycle?

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Nitrates (NO3-) are a form of nitrogen that plants can absorb and use for growth.