IB Biology Ecology and Evolution
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Created by:
rebekah_dek on July 24, 2012
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Year 11 IB Biology St Leonards
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17 terms
Terms | Definitions |
|---|---|
 species | a group of individuals of common ancestry that closely resemble eachother and that are normally capable of interbreeding to produce fertile offspring |
| habitat | the locality or surroundings in which an organism normally lives or the location of a living organism |
| population | a group of organisms of one species that interbreed and live in the same place at the same time |
| community | a group of populations of organisms living and interacting with eachother in a habitat |
| eco-system | a natural unit of living (biotic) componenets and living (abiotic) componenets eg. termperate deciduous |
| ecology | the study of relationships between living organisms and between organisms and their environment and a community and its abiotic environment |
| autotroph | an organism that is able to form nutritional organic substances from a single inorganic substance such as carbon dioxide |
| heterotroph | an organism deriving its nutritional requirements from complex organic substances |
| consumer | an organism that cannot synthesise its own food and its dependant on complex organic substances for nutrition |
| detritvore | an organism that feeds on detritus or organic waste |
| saprotroph | an organism that feeds on or derives nourishment from decaying organic matter |
| trophic | a feeding level in a food web or food chain |
| the precautionary principle | when an activity raises the threat of harm, measures should be taken to avoid the harm even if a causes and effect relationship has not been established |
| exponential growth phase | unlimited growth of population due to absence of limiting factors |
| transitional growth phase | limiting factors are beginning to slow the rate of the increase of population |
| plateu growth phase | growth has ceased due to the action of limiting factors |
| carry capacity | maximum number of individuals in an environment |
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