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Chapter 3 Vocabulary
Term | Definition |
---|---|
autotroph | organism that is able to capture energy from sunlight or chemicals and use it to produce its own food |
primary producer | first producer of energy rich compounds that are later used by other organisms |
photosynthesis | process used by plants to produce food from sunlight |
chemosynthesis | process in which chemical energy is used to produce carbohydrates |
heterotroph | organism that obtains food by consuming other living things |
consumer | organism that relies on other organisms for its energy and food supply |
carnivore | obtains energy by eating other animals |
herbivore | obtains energy by eating plants |
scavenger | consumes carcasses of other animals |
omnivore | eats both plants and animals |
decomposer | breaks down and obtains energy from dead organic matter |
detritivore | organism that feeds on plant and animal remains and other dead matter |
food chain | a series of organisms interrelated in their feeding habits |
phytoplankton | photosynthetic algae found near the surface of the ocean |
food web | series of organisms related by predator-prey and consumer-resource interactions |
zooplankton | small free-floating animals that form part of plankton |
trophic level | each step in a food chain or food web |
ecological pyramid | illustration of the relative amounts of energy or matter contained within each trophic level in a given food chain or food web |
biomass | amount of living matter in a given habitat |
biogeochemical cycle | process in which elements, chemical compounds, and other forms of matter are passed from one organism to another and from one part of the biosphere to another |
nutrient | nourishing, providing nutrition |
nitrogen fixation | process of converting nitrogen gas into nitrogen compounds that plants can absorb and use |
denitrification | process by which bacteria convert nitrates into nitrogen gas |
limiting nutrient | single essential nutrient that limits productivity in an ecosystem |