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sci quiz
fuh
| Question | Answer |
|---|---|
| a group of organisms of the same species, living in a particular area. | population |
| this changes over time. | population size |
| this describes the number of individuals per unit area or volume. | population density |
| the population growth is affected by: (5), and describe what they mean. | 1 births (natality) - increase population 2 deaths (mortality) - decrease population 3 immigration - individuals enter a population 4 emigration - individuals leave a population 5 resource availability |
| the two factors that affect population growth: | biotic factors, abiotic factors |
| biotic factors that affect population growth (5) | 1 competition 2 predation 3 disease 4 food availability 5 availability of mates |
| abiotic factors that affect population growth (6) | 1 temperature 2 water 3 natural disaster 4 light 5 soil condition 6 climate |
| this produces a j-shaped curve under idealized conditions. there is rapid increase, sources are initially abundant, and there are no strong limiting factors in the simplified model | exponential growth |
| this produces an s-shaped curve as growth is limited. it has rapid initial growth, but it slows as limiting factors increase. the population flunctuates around or approaches carrying capacity | logistic growth |
| is the sustainable population size an environment can support under particular conditions | carrying capacity |
| prevent unlimited population growth | limiting factors |
| carrying capacity can be affected by: (6) | 1 food 2 water 3 space 4 shelter 5 predation 6 environmental conditions |
| the two limiting factors | density-dependent factors & density-independent factors |
| their effects generally become stronger as the population density increases. (diseases, parasitism, predation, competition) | density-dependent factors |
| they affect population regard less of th epopulation desnity examples: natural disasters | density-independent factors |
| human impact on carrying capacity (3) | 1 deforestation 2 habitat destruction 3 overconsumption of resources |
| relationships in the ecosystem and meaning (5) | 1 competition - competing 2 predation - predator and prey 3 mutualism - mutual benefit 4 parasitism - parasite and host, harms them 5 comensalism - one benefits without harming the other |
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