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Ecosystems

TermDefinition
Organism Living thing
Habitat Environment that provides the things a specific organism needs to live, grow, and reproduce
Biotic factor Parts of a habitat that are or were once alive
Abiotic factor Nonliving parts of an organism’s habitat
Species Group of organisms that can mate with each other and produce offspring
Population All the members of one species living in a particular area
Community All the different populations that live together in an area
Ecosystem Community of organisms that lives in a particular area, along with the nonliving environment
Ecology The study of how organisms interact with each other and with their environment
Population Density The number of individuals in an area of a specific size
Limiting factor An environmental factor that causes a population to stop growing or to decrease in size
Carrying capacity The largest population that an area can support
Producer An organism that can make its own food
Consumer Obtains energy by feeding on other organisms
Decomposer Breaks down biotic waste and dead organisms
Food chain A series of events in which an organism eats another and obtains energy and nutrients
Food web Consists of many overlapping food chains in an ecosystem
Energy pyramid Shows the amount of energy that moves from one feeding level to another
Photosynthesis Set of chemical reactions plants use to turn light, water, and nutrients into oxygen and energy
Chlorophyll Absorbs light
Autotroph An organism that makes its own food
Heterotroph An organism that has to get its food from a source
Niche A niche includes how an organism obtains its food, the type of food the organism eats, and what other organisms eat
Competition The struggle between organisms to survive as they use the same limited resources
Predation An interaction in which one organism kills another for food or nutrients
Symbiosis Any relationship in which two species live closely together
Commensalism A relationship in which one species benefits and the other species is neither helped nor harmed
Mutualism A relationship in which both species benefit
Created by: user-1979192
 

 



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