What is the carbon cycle?
Carbon and Nitrogen Cycles

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Science
•
9th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
Back
The carbon cycle is the process by which carbon is exchanged among the atmosphere, land, water, and living organisms. It involves processes like photosynthesis, respiration, decomposition, and combustion.
2.
FLASHCARD QUESTION
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, including nitrogen fixation, nitrification, and denitrification.
3.
FLASHCARD QUESTION
Front
Define ammonification.
Back
Ammonification is the process by which bacteria convert organic nitrogen from dead organisms and waste into ammonia, making it available for plants.
4.
FLASHCARD QUESTION
Front
What is nitrification?
Back
Nitrification is the process by which ammonia is converted into nitrites and then into nitrates by bacteria, making nitrogen available to plants.
5.
FLASHCARD QUESTION
Front
What is denitrification?
Back
Denitrification is the process by which bacteria convert nitrates back into nitrogen gas, returning it to the atmosphere.
6.
FLASHCARD QUESTION
Front
What role do heterotrophs play in the nitrogen cycle?
Back
Heterotrophs obtain nitrogen by consuming plants or other organisms, which is essential for building proteins.
7.
FLASHCARD QUESTION
Front
How do plants absorb nitrogen?
Back
Plants absorb nitrogen primarily in the form of nitrates from the soil, which they use to synthesize proteins and nucleic acids.
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