DSST Env.Sci. Chp. 3 Word Scramble
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Question | Answer |
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 |
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