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Ecology Test Review
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This is a graph of... A Population Size B C Time Carrying capacity
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Autotrophs are the only food these organisms eat
Primary Consumers
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These organisms have the ability to change light energy into chemical energy
Producers
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These organisms digest dead plant and animal tissue
Decomposers
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These organisms are also called carnivores
Secondary consumers
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Herbivores? Shrimp, snail, vole, mouse, rat, sparrow, mallard, smelt
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In an ecosystem, these organisms are most likely to be the first to increase in population size.
Producers
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Carrying capacity is reached
What happens at A? A Population Size B C Time Carrying capacity is reached
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Maximum growth rate, abundant resources
What happens at B? A B Population Size C Time Maximum growth rate, abundant resources
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Low growth rate due to low resources
What happens at C? A Population Size B C Time Low growth rate due to low resources
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What is the annual population growth rate
What is the annual population growth rate? Year one fish Year two 30 fish Year three 10 fish -5 fish per year
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How much energy is lost during each step of the food chain?
90%
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What is a climax community?
Mature community in succession has most biodiversity
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These organisms are also called herbivores
Primary consumers
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Define parasitism and give an example
Ecological relationship in which one organism benefits and one is harmed Example: Mosquito and human
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What two factors contribute to an increasing population growth rate?
Immigration and birth rate
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How are matter and energy cycled in an ecosystem?
Matter is recycled and energy is lost
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Rabbits eat grass, foxes eat rabbits, wolves eat foxes
Rabbits eat grass, foxes eat rabbits, wolves eat foxes. That is an example of ….. Food chain
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The only heterotrophs required in an ecosystem are ...
Herbivores
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Define commensalism and give an example.
An ecological relationship that benefits one organism but the other organism is not harmed or helped. A cowbird and cattle. The cowbird gets insects as they are disturbed by cattle.
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Producer? Aquatic, Terrestrial plants
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What do decomposers do? Be specific.
Break down organic matter into usable molecules for producers
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Give an example of a producer and consumer relationship
Grasshopper eating grass
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The end result of ecological succession is usually a
Climax community
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Define mutualism and give an example
An ecological relationship that benefits both organisms. A bee pollinating a flower. The bee gets nectar the flower gets pollinated.
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All organisms that inhabit a particular area.
Define community All organisms that inhabit a particular area.
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If all the carnivores in an area die what is the MOST likely result?
The herbivores increase and the producers decrease.
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Define population A group of interbreeding organisms of the same species that live in the same area.
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4th order consumer? Hawk, Owl
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Food chain
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? 10,000 cal 10 cal
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How do primary and secondary succession differ?
Primary succession occurs on areas without soil, secondary occurs after something disturbs an existing habitat.
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Give an example of a density dependent limiting factor
Competition, predation, disease
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A species role in its habitat
What is a niche A species role in its habitat
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