Unit #1 Review A

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Trophic Level

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A step in the food chain, food web, or ecological pyramid that indicates the position of an organism in relation to the flow of energy and nutrients.

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Niche

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The unique position that a species has in the physical use of its habitat and in its function (job) within an ecosystem.

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Producer

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An organism that makes its own food by using sunlight or chemicals; also known as an autotroph.

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Heterotroph

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An organism that relies on other organisms for food; also known as a consumer.

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Ecosystem

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All the organisms in a particular location, including their nonliving environment.

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Biotic Factors

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Living components of an ecosystem, such as plants, animals, and microorganisms.

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Abiotic Factors

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Nonliving components of an ecosystem, such as sunlight, water, temperature, and soil.

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Consumer

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An organism that obtains energy by feeding on other organisms.

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Decomposer

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An organism that breaks down dead or decaying organisms, returning nutrients to the ecosystem.

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Herbivore

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An organism that primarily eats plants.