26 terms

Unit 2 Energy Flow and Nutrient Cycling

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Terms in this set (...)

Producer
an organism that uses sunlight to make its own food; also know as an autotroph
Consumer
an organism that eat other organisms for food; also known as a heterotroph
Herbivore
an organism that eats only plants
Carnivore
an organism that eats animals
Omnivore
an organism that eats both plants and animals
Scavenger
an organism that eats dead plants and animals
Decomposer
an organism that gets energy by breaking down dead organisms
Food Chain
a diagram that shows all the feeding relationships between organisms in an ecosystem
Food Web
a diagram that shows an ecosystem's loss of energy, which results as energy passes through the ecosystem's food chain
Energy Pyramid
a diagram that shows an ecosystem's loss of energy, which results as energy passes through the ecosystem's food chain
Limiting Factor
something such as food, water, or space that limits the size of a population
Carrying Capacity
the largest population that an environment can support at any given time
Predator
an organism that kills and eats another for food
Prey
an organism that is killed and eaten by another organism
Competition
occurs when two or more organisms or populations try to use the same resource
Symbiosis
a close, long-term association between two or more species
Mutualism
a relationship between two species in which both species benefit
Commensalism
a relationship between two organisms in which one organism benefits and the other is unaffected
Parasitism
a relationship between two species in which one species, the parasite, benefits from the other species, the host, which is harmed
Water Cycle
the movement of water between the oceans, atmosphere, land and living things
Carbon Cycle
the exchange of carbon between the environment and living things
Decomposition
the breakdown of substances into simpler molecules
Combustion
the burning of a substance
Photosynthesis
process in which some organisms use sunlight, carbon dioxide and water to make food
Respiration
the exchange of oxygen and carbon dioxide between living cells and their environment; includes breathing and cellular respiration
Nitrogen Cycle
the movement of nitrogen between the environment and living things