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31 terms

Ecology Study Guide

Mr. Mechienichs test on fri.
STUDY
PLAY
heterotrophs
organisms that cannot make their own food
tropic level
the position an organism occupies in a food chain, e.g. producer, secondary consumer, decomposer
primary producer
Organisms that produce energy available for other organisms to eat
primary consumer
An organism that eats producers
secondary consumer
An organism that eats primary consumers
tertiary consumer
An organism that eats secondary consumers
herbivore
plant eater
omnivore
eats plants and animals
carnivore
a flesh-eating animal
detrivore
organism that obtains its energy by feeding on dead organisms or wastes
10% rule
10% of the energy is transfered from one level to the next
biomass
the total mass of living matter in a given unit area
decomposer
eats and breaks down dead matter
symbiosis
the relation between two different species of organisms that are interdependent
Mutualism
both species benefit from the relationship
Commensalism
symbiotic relationship where one partner benefits & the other is unaffected
parasitism
one species benefits while the other is harmed
Competition
struggle between organisms to survive in a habitat with limited resources
Predation
Killing an eating another organism
Neutralism
both species remain unaffected
Ecosystem
a community of organisms and their non-living environment
Community
a group of interdependent organisms inhabiting the same region and interacting with each other
population
a group of the same organisms that live in a certian area
biosphere
a part of the earth where life exsists including land, water and air
nitrogen
the most common gas in the atmosphere, making up 78% of gases in dry air
nitrogen fixation
certain bacteria convert nitrogen gas into ammonia
denitrification
changing nitrates into nitrogen gas
carbon fixation
process of carbon dioxide into organic compounds
condensation
gas to a liquid
transpiration
loss of water from a plant thourgh its leaves
evaporation
liquid to a gas