ecology CFA

It has been a very harsh winter. The ground is covered in snow, and the trees are covered in ice. Many deer die because they cannot find food. This is an example of

• producers providing food.

• a limiting factor controlling a population

• a biosphere in trouble

• predators harvesting the weak and the sick

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Limiting factors determine an area’s populations because

• the number of organisms is always the same.

• ecosystems are small.

• organisms need resources to survive

• the number of organisms is unlimited.

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A diagram with arrows showing energy flow from grass, to a rabbit, to a fox is

• an energy pyramid.

• food web

• food chain

• population chart

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Grass that gains energy from the sun is an example of a

• consumer

• parasite

• decomposer

• producer

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In a food web arrows point in just one direction because they show

• which organism is bigger.

• which organisms are related.

• how energy goes to the organism that is eating

• how energy goes to the organism that is being eaten.

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A community is several species of animals interacting, while a population is

• members of one species in an area.

• the biotic and abiotic elements of an area

• the nonliving elements of a habitat.

• single organism

One food web arrow goes from a prairie dog to a coyote, showing that

• the coyote is bigger

• the coyote eats the prairie dog

• he prairie dog eats the coyote.

• the prairie dog is a producer

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Which is an example of an abiotic element changing an area?

• introducing a new type of grass

• water flooding the area

• two species of birds competing

• algae growing on crabgrass

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The plants a ladybug lives on, the aphids the ladybug eats, and the birds that would eat the ladybug are all

• biotic elements of an ecosystem

• predators

• producers

• abiotic elements of an ecosystem

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What do several different populations living together make?

• biosphere

• an organism

• a community

• an ecosystem