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7th grade biology

Eco systems and how they change.

TermDefinition
Organism A living thing that has an organized structure, can react to stimuli, reproduce, grow, adapt, and maintain homeostasis.
Habitat A place where an organism or a community of organisms lives, including all living and nonliving factors or conditions of the surrounding environment.
Biotic Factor A factor created by a living thing or any living component within an environment in which the action of the organism affects the life of another organism, for example a predator consuming its prey.
Abiotic Factor A nonliving condition or thing, as climate or habitat, that influences or affects an ecosystem and the organisms in it
Population A group of organisms of a species that interbreed and live in the same place at a same time.
Community An interacting group of various species in a common location.
Ecosystem A system that includes all living organisms in an area as well as its physical environment functioning together as a unit.
Limiting Factor The factor that limits the reaction rate in any physiological process governed by many variables.
Producer Producers are organisms that make their own food.
Consumer An organism that generally obtains food by feeding on other organisms or organic matter.
Decomposer An organism whose ecological function involves the recycling of nutrients by performing the natural process of decomposition as it feeds on decaying organisms.
Food Chain A feeding hierarchy in which organisms in an ecosystem are grouped into trophic levels and are shown in a succession to represent the flow of food energy and the feeding relationships between them.
Food Web A graphical model depicting the many food chains linked together to show the feeding relationships of organisms in an ecosystem.
Energy Pyramid A model that shows the flow of energy from one trophic, or feeding, level to the next in an ecosystem.
Niche The way in which an organism fits into an ecological community or ecosystem.
Competition An interaction between organisms or species in which both the organisms or species are harmed.
Predation A biological interaction where one organism, the predator, kills and eats another organism, its prey.
Symbiosis A close and prolonged interaction between organisms of different species.
Commensalism An association between two organisms in which one benefits and the other derives neither benefit nor harm.
Mutualism As interactions between organisms of two different species, in which each organism benefits from the interaction in some way.
Parasitism A relationship between two organisms where one benefits, and the other is harmed.
Succession The process of change in the species structure of an ecological community over time.
Pioneer Species The first to colonize an ecosystem previously disturbed or damaged.
Created by: Julian Mcke
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