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Chapter 2 Vocab

TermDefinition
Abiotic factor the nonliving factors in an organism's environment
Biological community a group of interacting populations that occupy the same geographic area at the same time
Biome a large group of ecosystems that share the same climate and have similar types of communities
Biosphere the portion of Earth that supports life
Biotic factor the living factors in an organism's environment
Commensalism a relationship in which one organism benefits and the other organism is neither harmed nor helped
Ecology the scientific discipline in which the relationships among living organisms and the interaction the organisms have with their environment are studied
Ecosystem a biological community and all of the abiotic factors that affect it
Habitat an area where an organism lives
Mutualism the relationship between two or more organisms that live closely together and benefit from each other
Niche the role or position that an organism has in its environment
Parasitism a symbiotic relationship in which one organism benefits at the expense of another organism
Population individual organisms of a single species that share the same geographic location at the same time
Predation the act of one organism consuming another organism for food
Symbiosis the close relationship that exist when two or more species live together
Autotroph an organism that collects energy from sunlight or inorganic substances to produce food
Biomass the total mass of organisms in a given area or volume (organic matter used as a fuel, especially in a power station for the generation of electricity
Carnivore heterotrophs that prey on other heterotrophs
Detritivore heterotroph that decomposes organic material and returns the nutrients to soil, air, and water, making the nutrients available to other organisms.
Food chain a simple model that shows how energy flows through an ecosystem
Food web a model representing the many interconnected food chains and pathways in which energy flows through a group of organisms
Herbivore a heterotroph that eats only plants
Heterotroph an organism that gets its energy requirements by consuming other organisms
Omnivore organisms that eat both plants and animals
Trophic level each step in the food chain or food web
Biochemical cycle the exchange of matter through the biosphere
Denitrification process in which fixed nitrogen compounds are converted back into nitrogen gas returned to the atmosphere
Matter anything that takes up space and has mass
Nitrogen fixation the process of capture and conversion of nitrogen into a form that is useable by plants
Nutrient a chemical substance that an organism must obtain from its environment to sustain life and undergo life process
Created by: sjaco