Terms for chapter 18 section 3
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| producer | an organism that can make organic molecules from inorganic molecules; a photosynthetic or chemosynthetic autotroph that serves as the food source in an ecosystem
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| chemosythesis | the production of carbohydrates through the use of energy from inorganic molecules instead of light
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| gross primary productivity | the rate at which organic matter is assimilated by plants and other producers during a period of time over a certain area
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| biomass | any organic material that has been produced in an ecosystem
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| net primary productivity | the rate at which biomass accumulates in an ecosystem
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| consumer | an organism that eats other organisms or organic matter instead of producing its own nutrients or obtaining nutrients from inorganic sources
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| herbivore | an organism that eats only plants
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| carnivore | an organism that eats animals
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| omnivore | an organism that eats a variety of other organisms, including plants and animals
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| detritivore | a consumer that feeds on dead organisms or on the other parts or wastes of other organisms
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| decomposer | an organism that feeds by breaking down organic matter from dead organisms; examples include bacteria and fungi
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| trophic level | an organism's relative porition in a sequence of energy transfers in a food chain or food pyramid, examples include prodcers and primary, secondary, and tertiary consumers
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| food chain | the pathway of eergy transfer through various stages as a result of the feeding patterns of a series of organisms
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| food web | a diagram that shows the feeding relationship among organisms in an ecosystem
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