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25 Cards in this Set

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ecology
the study of interactions among organisms
biosphere
contains the combined portions of the planet in which all of life exists
species
is a group of organisms so similar they can breed
population
groups of individuals
community
is a group of different species
ecosystem
is a collection of all the organisms that live in a particular place
biome
is a group of ecosystems thtat have the same climate and similar dominat communities
autotroph
use energy from the environment to fuel the assembly of simple inorganic compounds into complex organic molecules
photosynthesis
using the sun to create food
chemosynthesis
organisms use chemical energy to produce carbiohydrates
consumer
organisms that rely on other organisms for their energy and food
carnivore
eat both plants and animals
detritivore
eat dead stuff
food chain
the transfer on energy
trophic level
each step in the food chair
ecological pyramid
diagram that shows the relative amounts of energy contained within each trophic level
biogeochemical cycle
elements r passed from one oranism to the another
evaporation
the process in which water turns to a gas
transpiration
the process in which a gas turns to water
nutrient
all chemical substances that an organism needs to sustain life
nitrogen fixation
when lagumes convert nitrogen gas into ammonia
denitrification
other soil bacteria convert nitrates into nitrogen gas
primary productivity
the rate at which organic matter is created by producers
limiting nutrient
when an ecosystem is limited by a single nutrient that is scarce or cycles very slowly
algal bloom
when an aquatic ecoststem receives a large input of a limited nutrient, this results in an increase in the amount of algae