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AP Biology Unit 8 Vocab- Magdaleno

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Term
Definition
Biotic factor   Living component of an ecosystem  
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Abiotic factor   Non-living component of an ecosystem; ex: amount of light, temperature  
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Biomass   The total mass of organic matter comprising a group of organisms in a particular habitat  
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Biodiversity   The variety of life in the world or in a particular habitat or ecosystem  
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Autotroph   An organism that obtains organic food molecules (ex: glucose) without eating; first trophic level in an ecosystem  
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Photosynthesis   The process of using energy from sunlight to produce carbohydrates or food  
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Cellular respiration   The process of breaking down organic molecules to produce ATP  
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Chemosynthesis   The process of using energy derived from inorganic molecules to produce carbohydrates or food  
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Inorganic   Not consisting of or deriving from living matter; ex: ammonia, hydrogen sulfide, methane  
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Heterotroph   An organism that obtains organic food molecules (ex: glucose) by eating  
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Detritivore/ decomposers   A consumer that derives its energy and nutrients from nonliving organic material such as corpses, fallen plant material, and the wastes of living organisms  
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Omnivores   Eats both consumers and producers  
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Carnivores   Eats other consumers  
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Herbivory   An interaction in which an organism eats parts of a plant or algae  
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Trophic level   A feeding level in an ecosysem  
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Primary consumer   An organism that eats plants or other autotrophs; a herbivore or omnivore  
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Secondary consumer   An organism that eats the first consumer; a carnivore or omnivore  
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Symbiosis   A relationship between organisms of two different species that live together in direct contact; ex: mutualism, parasitism, and commensalism  
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Mutualism   A symbiotic relationship in which both organisms benefit  
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Parasitism   A symbiotic relationship in which one organism, the parasite, benefits at the expense of another, the host, by living within or on the host  
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Invasive species   Species that have been introduced, or moved, by human activities to a location they do not naturally occur and cause ecological problems  
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Exponential growth   Growth of a population in an ideal, unlimited environment; represented by a J-shaped curve when population size is plotted over time  
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Logistic growth   Population growth that levels off as population size approaches carrying capacity  
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Carrying capacity   The maximum population size that can be supported by the available resources; symbolized as K  
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Limiting factor   A factor that restrains growth of a population  
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Density-dependent factor   Are factors where the effects on the size or growth of a population vary with the density of the population itself; ex: competition for resources, predation, or disease  
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Keystone species   A species that is not necessarily abundant in a community yet exerts strong control on community structure by the nature of its ecological role or niche  
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Density-independent factor   Any factor limiting the size of a population whose effect is not dependent on the number of individuals in the population; ex: deforestation  
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Population   A group of individuals of the same species that live in the same area  
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Community   All the organisms that inhabit a particular area  
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Commensalism   A relationship between two organisms in which one organism benefits and the other is unaffected  
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Thermoregulation   Process of maintaining an internal temperature within a tolerable range.  
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Endotherm   An organism that is internally warmed by a heat-generating metabolic process; warm blooded  
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Ectotherm   Ectotherm  
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