

Ch 3 Ecosystem dynamics
Flashcard
•
Science
•
12th Grade
•
Practice Problem
•
Hard
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15 questions
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1.
FLASHCARD QUESTION
Front
What is nitrogen fixation?
Back
The process of converting atmospheric nitrogen (N2) into a form usable by living organisms, primarily accomplished by bacteria.
2.
FLASHCARD QUESTION
Front
Which organisms are primarily responsible for nitrogen fixation?
Back
Bacteria, particularly those in the root nodules of legumes.
3.
FLASHCARD QUESTION
Front
What is the role of decomposers in an ecosystem?
Back
Decomposers break down dead organic matter, recycling nutrients back into the soil.
4.
FLASHCARD QUESTION
Front
What is an energy pyramid?
Back
A graphical representation of the energy flow in an ecosystem, showing the energy available at each trophic level.
5.
FLASHCARD QUESTION
Front
How much energy is typically lost at each trophic level in an energy pyramid?
Back
About 90% of energy is lost as heat or used for survival at each level.
6.
FLASHCARD QUESTION
Front
What is the troposphere?
Back
The lowest layer of Earth's atmosphere where weather occurs and where the air we breathe is found.
7.
FLASHCARD QUESTION
Front
What is the biosphere?
Back
The global sum of all ecosystems, representing the zone of life on Earth.
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