bio test (15-16) Flashcards
study of how living things interact with one
another and with their physical environment
ecology
organism’s environment or home
habitat
relatively thin layer of Earth’s surface in which life exists
biosphere
basic unit of ecology and may be defined as the interrelated network of all organisms and their environment within a limited area
ecosystem
smallest living unit of the biosphere
organism
all of the living things in an ecosystem
community
abiotic factors
temperature, radiation, atmosphere, wind, water, soil
ideal range of values for an environmental factor in which an organism can thrive
optimum range
any factor outside an organism’s tolerance range
limiting factor
consumers that feed on only plants
herbivores
a model used by ecologists to show all possible feeding relationships at each trophic level
food web
relationship in which both organisms benefit
mutualism
model used by ecologists to show the nutritional relationships among organisms in an ecosystem
food chain
relationship between two organisms in which one benefits while the other is harmed
parastitism
consumers that feed only on other animals
carnivores
relationship with a predator and prey
predation
biogeochemical cycle in which water moves from the soil and from the water surfaces of the earth, through the atmosphere, and back to the earth again
hydrologic cycle
grazing animals feed on plants by cropping portions of the plant without killing it
herbivory
treeless northern biome that has long, harsh winters and permafrost
arctic tundra
relationship in which one organism is benefited and the other is neither harmed nor helped
commensalism
biome that has well-defined seasons and is dominated by deciduous broadleaf trees
temperate deciduous forest
high mountain altitudes. has vegetation and climatic conditions similar to those of the Arctic tundra, although the soil has better drainage and lacks permafrost.
alpine tundra
rich and beautiful prairies and plains of North
America, whose fertile soils are almost without rival in the world
grassland
long winters and heavy snowfalls. boreal forest- or taiga.
northern coniferous forest