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Stack #46840

Ecology - Unit 1

WordDefinition
Biotic A living factor in the environment.
Abiotic A non-living factor in the environment.
Ecosystem All of the living organisms in an area and the non-living environment around them.
Environment All of the living and non-living things that affect an organism in its lifetime.
Organism A living thing.
Habitat The place where an organism lives.
Niche An organisms job in the environment.
Trophic level A level of energy consumption in an ecosystem.
Producers The lowest trophic level, producers use light energy to make chemical enerrgy. Plants.
Consumers A trophic level that must eat or absorb energy from producers.
decomposers Organisms that obtain their energy from dead organisms.
primary consumers Consumers that get their energy directly from producers. Herbivores.
secondary consumers Consumers that get their energy indirectly from producers. Can be carnivores, omnivores or decomposers.
Predation A reletionship where one organism hunts, kills and eats another.
Competition A relationship where two organisms try to use the same resource.
Symbiosis A close relationship between two organisms.
Parasitism A symbiotic relationship where one organism (the parasite) harms or kills another (the host.)
commensalism A symbiotic relationship where one organism benefits and the other is neither helped nor harmed.
Mutualism A symbiotic relationship where both organisms benefit.
Limiting Factor Anything in the environment that can keep a population of organisms from growing exponentially.
Competitive Exclusion Principle The idea that no two organisms can occupy the same habitat and niche at the same time.
Created by: Holly Thomas
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