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IB Biology 4.1 Species, communities and ecosystems

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Abiotic factors

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Terms in this set (19)

Abiotic factors

the non-living physical and chemical attributes of a system, for example light or temperature in an environment.

an organism that uses solar energy or chemical energy to manufacture the organic compounds it needs as nutrients from simple inorganic compounds obtained from its environment.

attributes in an ecosystem that refer to living organisms.

Chi-squared test

a statistical test of the fit between a theoretical frequency distribution and a frequency distribution of observed data for which each observation may fall into one of several classes.

formed by populations of different species living together and interacting with each other.

heterotrophs that feed on living organisms by ingestion.

when members of different species breed together.

heterotrophs that obtain organic nutrients from dead organisms by internal digestion.

community of different species interacting with each other and with the chemical and physical factors making up the non-living environment.

an organism that gets its organic nutrients by feeding on autotrophs or other heterotrophs.

Inorganic nutrients

chemical elements, compounds, and other substances necessary to sustain life processes that are not chemically carbon-based.

when two members of the same species mate and produce offspring.

an experimental tool that brings a small part of the natural environment under controlled conditions.

a group of organisms of the same species who live in the same area at the same time.

Quadrat sampling

square or rectangular plot of land, a quadrat, marked off at random to isolate a sample and determine the percentage of vegetation and animals occurring within the marked area.