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Flow of Matter

in the Environment

TermDefinition
microorganism a living thing that is too small to be seen with the naked eye
food chain sequence of organisms through which nutrients and energy pass as one organism eats another
food web model showing the many food chains linked together to show the feeding relationships of organisms in an ecosystem
energy pyramid a graphical representation, showing the flow of energy at each trophic level in an ecosystem
nutrient food, or any nourishing substances used by an organism required for growth, repair, and normal metabolism
nitrogen fixation a process in which nitrogen gas (N2) from the atmosphere is incorporated into the tissue of certain plants
decomposers an organism that decomposes, or breaks down, organic material such as the remains of dead organisms
autotroph an organism that can produce its own food using light, water, carbon dioxide, or other chemicals
producer organisms capable of creating simple carbohydrates such as glucose, from gaseous carbon dioxide
photosynthesis a process used by plants and other organisms to convert light energy into chemical energy
carnivore an animal that eats a diet consisting mainly of meat
consumer organisms that need to eat (i.e. consume) food to obtain their energy
herbivore an organism that mostly feeds on plants
omnivore an animal that has the ability to eat and survive on both plants and animals
detritivore an organism that eats dead or decaying plants or animals as food
biomass the mass of living organisms in a given area or ecosystem at a given time
heterotroph an organism that cannot produce its own food, instead it gets nutrition from other sources: mainly plant or animal matter.
trophic level the trophic level of an organism is the number of steps it is from the start of the chain, web, or energy pyramid including or from the producers
Created by: NEISDSci
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