Nitrogen Cycle
Flashcard
•
Science
•
7th Grade
•
Practice Problem
•
Hard
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15 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 nitrogen gas, nitrates, and ammonia, in the environment.
2.
FLASHCARD QUESTION
Front
What do plants absorb from the soil in the nitrogen cycle?
Back
Plants absorb nitrates from the soil.
3.
FLASHCARD QUESTION
Front
What does nitrogen fixation refer to?
Back
Nitrogen fixation is the process of converting nitrogen gas from the atmosphere into usable compounds like ammonia or nitrates.
4.
FLASHCARD QUESTION
Front
What is assimilation in the context of the nitrogen cycle?
Back
Assimilation is the process by which plants absorb nitrates through their roots and incorporate them into their tissues.
5.
FLASHCARD QUESTION
Front
What role do decomposers play in the nitrogen cycle?
Back
Decomposers break down dead organic matter, releasing nitrogen back into the soil as ammonia.
6.
FLASHCARD QUESTION
Front
What is denitrification?
Back
Denitrification is the process by which nitrates in the soil are converted back into nitrogen gas, returning it to the atmosphere.
7.
FLASHCARD QUESTION
Front
What is the main source of nitrogen in the atmosphere?
Back
The main source of nitrogen in the atmosphere is nitrogen gas (N2), which makes up about 78% of the air.
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