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Chapter 9 Vocab
N/A
15
Science
8th Grade
01/23/2012

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Term
Ecology
Definition
Study of all the interactions among organisms and their environment.
Term
Abiotic
Definition
Any nonliving part of the environment, such as water, sunlight, tempurature, and air.
Term
Biotic
Definition
Any living or once-living organism in the environment.
Term
Population
Definition
All of the individuals of one species that live in the same place at the same time.
Term
Community
Definition
All of the populations of different species in a given area that intercact in some way and depend on another for food, shelter, and other needs.
Term
Ecosystem
Definition
All of the communities in a given area and the abiotic factors that affect them.
Term
Bioshere
Definition
Part of the Earth that supports life - the top part of Earth's crust, all the waters covering Earth's surface, snf the surrounding atmosphere; includes all the biomes, ecosystems, communities, and populations.
Term
Population Density
Definition
Number of individuals in a population that occupies an area of limited size.
Term
Limiting Factor
Definition
Any biotic factor that limits the number of individuals in a populations.
Term
Symbiosis
Definition
Any close interaction among two or more different species, including mutualism, commensalism, and parasitism.
Term
Niche
Definition
Role of an organism in the ecosystem, including what it eats, how it interacts with other organisms, and how it gets food.
Term
Habitat
Definition
Place where an organism lives.
Term
Food Chain
Definition
Model that describes how energy passes from one organism to another.
Term
Food Web
Definition
Model that describes how energy from food moves through a community; a series of overlapping food chains.
Term
Water Cycle
Definition
Continuous cycle of water molecules on Earth as they rise into the atmoshere, fall back to Earth as rain or other precipitation, and flow into rivers and oceans through the process of evaporation, condensation, and precipitation.
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