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24 Cards in this Set
- Front
- Back
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ecology
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study of interactions between organsisms and their enviornments
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biosphere
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portion of Earth that supports life
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abiotic factors
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the nonliving parts of an organisms enviornment
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biotic factors
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the living parts of an organisms enviornment
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population
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group of organisms of one species that interbreed and live in the same place at the same time
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community
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collection of interacting populations
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ecosystem
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system made up of interactions among the populations in a community and the communities abiotic factors
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habitat
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place where organisms live out their lives
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niche
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the role and position a species has in its enviornment
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commensalism
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symbiotic relationship where one species benefits and the other is not effected
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mutualism
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symbiotic relationship between two species where both species benefit
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parasitism
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symbiotic relationship where one organism benefits while the other is harmed
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symbiosis
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relationship where there is a close and permanent assosiation among organisms
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what are examples of biotic & abiotic facors?
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biotic : trees, plants, organisms
abiotic : soil, air, rocks |
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compare and contrast populations and communities
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a population is a group of organisms of the same species that interact while a community is a group of populations of different species that interact
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autotroph
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organisms that use energy to create their own nutrients
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heterotroph
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organisms that cant make their own food and must feed on others for energy
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scavengers
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feed on carrion and refuse & play a benefitical role in the ecosystem
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decomposers
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organisms that break down and absorb nutrients from dead organisms
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food chain
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simple model that scientists use to show how matter and energy move through an ecosystem
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trophic level
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passage of energy and materials
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food web
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model that expresses all the possible feeding relationships at each trophic level in a community
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what is the difference between an autotrph and a heterotroph?
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an autotroph produces its own food while a heterotroph feeds on other organisms for energy
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why do autotrophs always occupy the lowest level of exological pyramids?
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they are the lowest because they supply energy to everyone
ex. flower -> butterfly -> squirrel |
