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Biology Chapter 3

Food Webs and Nutrient Cycles

TermDefinition
autotroph Makes food, producer
heterotroph Eats food, consumer
trophic level Feeding position or relationship in food chain
herbivores Organisms that consume plants only
photosynthesis Process that creates food from sunlight
ecological pyramid Represents biomass or energy at each trophic level
carnivores Organisms that consume meat only
omnivore Organisms that consume plants and meat
decomposer Breaks down decaying matter
detritivore Decomposer, returns nutrients to ecosystem
food chain Displays feeding relationships
food web Interconnecting food chains
biogeochemical cycle Cycling of substances between biotic and abiotic parts of ecosystem
nutrients Chemical needed to live and grow
nitrogen fixation Conversion of atmospheric nitrogen
denitrification Removal of nitrogen from ammonia
evaporation Water liquid to gas
transpiration Water from plants to atmosphere
primary productivity Rate of producers making food
limiting nutrient Nutrient in short supply versus others
algal bloom Excessive algae growth
Created by: Mrs.Benc
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