AP Environmental Science Flashcards: Trophic Levels
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
What is meant by 'high-quality energy' in the context of an ecosystem?
It is the continuous inflow of energy, typically from the sun, that is required to maintain an ecosystem's structure and function.
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What is meant by 'high-quality energy' in the context of an ecosystem?
It is the continuous inflow of energy, typically from the sun, that is required to maintain an ecosystem's structure and function.
What is the primary source of energy for most terrestrial and near-surface marine communities?
The sun provides the initial high-quality energy that flows from producers to higher trophic levels.
What role do producers play in the flow of energy?
Producers occupy the lowest trophic levels and are responsible for capturing energy from the sun, making it available to the rest of the community.
Why do ecosystems require a continuous input of energy?
All ecosystems depend on a continuous inflow of high-quality energy to maintain their structure and function.
If an ecosystem is stable, what does the principle of conservation of matter imply about the nutrients within it?
It implies that the essential matter for life is not lost but is continuously cycled through various biogeochemical pathways.
What fundamental law of science do biogeochemical cycles demonstrate?
Biogeochemical cycles demonstrate the conservation of matter, which states that matter is not created or destroyed.
A farmer applies a nitrogen-based fertilizer to a field. Does the nitrogen 'flow' through the local ecosystem or 'cycle' within it?
The nitrogen, as a form of matter, cycles within the ecosystem according to biogeochemical principles.
Describe the direction of energy flow through trophic levels in a near-surface marine community.
Energy flows from the sun to producers (like phytoplankton) in the lowest trophic levels and then moves upward to higher trophic levels (consumers).
What are biogeochemical cycles?
They are cycles essential for life that demonstrate the conservation of matter as it moves through an ecosystem.
How does the movement of energy differ from the movement of matter in trophic levels?
Energy flows in one direction through trophic levels, while matter cycles within the ecosystem.