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17 Cards in this Set
- Front
- Back
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What is an ecosystem?
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An ecosystem consists of all the species in a community, their interaction with one another, and their interaction with the abiotic factors in the environment.
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Why are ecosystems more complex than communities?
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Ecosystems are more complex than communities due to the input and transfer of energy, and the input, transfer, and cycling of chemicals among trophic levels.
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What physical laws must ecosystems obey?
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Ecosystems require external energy and must transfer it into a biologically useful form of energy.
Energy is lost when it is transferred between trophic levels. Only some of the energy in consumed food is converted into new cells and tissues. Ecosystems require chemical inputs. |
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How do primary producers introduce biologically-useful energy into their ecosystems?
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photosynthesis
chemosynthesis |
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What brings inorganic nutrients into the ecosystem?
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primary producers
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What are chemicals used as a source for in ecosystems?
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Chemicals are used to make biological molecules and act as co-factors for enzymatic reactions.
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What introduces nitrogen into ecosystems?
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Nitrogen fixing species introduce nitrogen into ecosystems.
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What is used to make amino acids and polypeptides?
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NH3
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What 3 types of functional groups are necessary to maintain a sustainable ecosystem?
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producers, decomposers, and Nitrogen fixing species
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What role do decomposers play?
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Decomposers release and recycle nutrients from dead organic matter.
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Which level has the greatest number of individuals?
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Primary producers
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Which level has the greatest biomass (weight of cells and tissues)?
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primary producers
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Which level has the greatest collective energy?
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primary producers
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What does the Green World Hypothesis state?
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The Green World Hypothesis states that ecosystems are stable because primary producer populations are stable.
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Which level has the greatest biomass (weight of cells and tissues)?
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primary producers
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Which level has the greatest collective energy?
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primary producers
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What does the Green World Hypothesis state?
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The Green World Hypothesis states that ecosystems are stable because primary producer populations are stable.
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