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MB 18.3
MB Chapter 18, Section 3
| Term | Definition |
|---|---|
| producer | an organism that can make organic molecules from inorganic molecules; a photosynthetic or chemosynthetic autotroph that serves as the basic food source in an ecosystem |
| chemosynthesis | the production of carbohydrates through the use of energy from inorganic molecules instead of light |
| 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 |
| biomass | plant material, manure, or any other organic matter that is used as an energy source |
| net primary productivity | the rate at which biomass accumulates in an ecosystem |
| consumer | an organism that eats other organisms or organic matter instead of producing its own nutrients or obtaining nutrients from inorganic sources |
| herbivore | an organism that eats only plants |
| carnivore | an organism that eats animals |
| omnivore | an organism that eats both plants and animals |
| detritivore | a consumer that feeds on dead plants and animals |
| decomposer | an organism that feeds by breaking down organic matter from dead organisms; examples include bacteria and fungi |
| trophic level | one of the steps in a food chain or food pyramid; examples include producers and primary, secondary, and tertiary consumers |
| food chain | the pathway of energy transfer through various stages as a result of the feeding patterns of a series of organisms |
| food web | a diagram that shows the feeding relationships between organisms in an ecosystem |
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simmonsr20
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