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Practice questions for this set
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Eat both plants and animals
Choose an answer
1 carnivores 2 Omnivores
3 detritivores 4 detrivores
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Terms in this set (78)
Ecological community A group of populations of different species living in the same
area with varying degrees of interactions with others
Trophic levels each step in a food chain or food web
Primary producers autotrophs, get their energy directly from sunlight
Autotrophs Organisms that are able to make their own food
Heterotrophs An organism that obtains organic food molecules by eating
other organisms or their by-products.
Primary consumer herbivores
Secondary consumers eat the herbivores
, Tertiary consumers eat the secondary consumers
Detrivores organisms that feeds on plant and animal remains and other
dead matter
Decomposers Break down organic matter
Omnivores Eat both plants and animals
Carnivores Consumers that eat only animals
food chain/ food web The way energy moves through an ecosystem... how
organisms feed on eachother
biomass Total amount of living tissue within a given trophic level...
weight of living matter
10% rule Only 10% of the total energy produced at each trophic level is
available to the next level. The amount of energy passed up to
the levels of the food pyramid reduces as you go up.
predation a relationship in which one organism kills and eats another(+/-)
parasitism a relationship between two organisms of different species
where one benefits and the other is harmed (+/-)
competition a relationship where two organisms using the same resource
that is insufficient to supply the needs of both (-/-)
mutualism a relationship where both parties benefit (+/+)
commensalism a relationship between two organisms in which one organism
benefits and the other is unaffected (+/0)
amensalism a relationship in which one organism is harmed and the other
is unaffected (-/0)
batesian mimicry Species mimics the appearance of an unpalatable or harmful.
müllerian mimicry two or more unpalatable species resemble each other
interference competition one species interferes with the activities of another
exploitation competetion one species reduces the availability of a resource
infraspecific competition competition between the same species
interspecific competition competition between different species
competitive exclusion occurs when a superior competitor prevents another species
from using a habitat
ecosystem engineers organisms that create structures
keystone species a species that exerts influence out of proportion with its
abundance... they keep everyone in balance