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DSST Env.Sci. Chp. 3

vocab. for DSST Env.Sci. from Environmental Science by Karen Arms

QuestionAnswer
autotroph self-feeding organism that obtains its nutrients by synthesis from the environment, such as green plants
carbon cycle process in an ecosystem in which producers take in carbon dioxide from the atmosphere during photosynthesis and consumers, having eaten producers, release carbon into the atmosphere as carbon dioxide
carnivore consumer that eats only other consumers
cellular respiration process of breaking down food to yield energy
climax community final, stable community that forms when land is left undisturbed
consumer organisln that gets its energy by eating other organisms; heterotroph
DDT powerful insecticide; its use is limited by law because of its potential to damage the environment
Decomposer consumer that gets its food by breaking down dead organisms, causing them to rot
energy pyramid diagram in the form of a pyramid that shows how energy is lost from one trophic level to the next
fire-maintained communities communities where natural fires caused by lightning make secondary succession possible
food chain the sequence in which energy is transferred from one organism to the next as each organism eats and is then eaten by another
food web diagram showing the feeding relationships between organisms in an ecosystem
herbivore consumer that eats only producers
heterotroph consumer organism that gets its energy from eating other organisms
krill small, shrimplike crustaceans; the main food of whales
lichen composed of a particular fungus and a particular alga growing in a symbiotic relationship and forming a dual organism
nitrogen cycle process by which atmospheric nitrogen is converted into compounds for use by plants and animals, eventually returned by decay
nitrogen-fixing bacteria bacteria that convert nitrogen gas from the atmosphere into a form that plants can use
omnivore consumer that eats both plants and animals
perennial grass tall grass plants that live several years (as opposed to annual grasses) and that have a tendency to shade the ground, limiting growth of smaller plants
photosynthesis biological synthesis of chemical compounds in the presence of light; produces organic substances such as sugar
pioneers first organisms to colonize any newly available area and start the process of succession
precipitation rain, sleet, snow, or hail that has condensed from water vapor in the atmosphere and returns to the Earth's surface
primary succession succession that occurs in areas where no ecosystem has existed previously
producer organism that makes its own food; autotroph
secondary succession pattern of change in an area where an ecosystem has previously existed
succession the regular pattern of changes over time in the types of species in a community
trophic level a step in the transfer of energy through an ecosystem; the level of a food chain that an organism occupies
water cycle the continual process by which water circulates between the atmosphere and the Earth
energy the quantity that describes the capacity to do work
Created by: pinetreeacademy on 2012-04-29



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