Nitrogen Cycle
Flashcard
•
Science
•
9th Grade
•
Practice Problem
•
Hard
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14 questions
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1.
FLASHCARD QUESTION
Front
What is the nitrogen cycle?
Back
The nitrogen cycle is the process by which nitrogen is converted between its various chemical forms, including atmospheric nitrogen, ammonia, nitrates, and organic nitrogen compounds, through biological and physical processes.
2.
FLASHCARD QUESTION
Front
What is nitrogen fixation?
Back
Nitrogen fixation is the process of converting atmospheric nitrogen (N2) into ammonia (NH3), which can be used by plants.
3.
FLASHCARD QUESTION
Front
What role do bacteria play in the nitrogen cycle?
Back
Bacteria are essential in the nitrogen cycle as they perform processes like nitrogen fixation, nitrification, and denitrification, helping to convert nitrogen into forms usable by plants and animals.
4.
FLASHCARD QUESTION
Front
What is nitrification?
Back
Nitrification is the process by which ammonia is converted into nitrites (NO2-) and then into nitrates (NO3-), which plants can absorb.
5.
FLASHCARD QUESTION
Front
What is denitrification?
Back
Denitrification is the process by which nitrates are converted back into nitrogen gas (N2), returning nitrogen to the atmosphere.
6.
FLASHCARD QUESTION
Front
What is assimilation in the nitrogen cycle?
Back
Assimilation is the process by which plants absorb ammonium or nitrate from the soil to create organic molecules like DNA and proteins.
7.
FLASHCARD QUESTION
Front
What is ammonification?
Back
Ammonification is the process of converting organic nitrogen from dead organisms and waste into ammonia.
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