8.11 A: Competition in Ecosystems

Primary consumers compete most for _______.

• sunlight

• oxygen

• space

• food

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Which two species most likely compete for water?

• X

• Y

• Z

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Which organisms in the food web compete for the same food source in this environment?

• Mice and bobcats

• Coyotes and bobcats

• Insects and coyotes

• Plants and mice

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Which organism competes with bass for food in this ecosystem?

• Catfish

• Pickerel

• Copepods

• Snails

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Which of the following activities represents competition among organisms?

• A cougar attacks and eats an elk from a herd

• A cougar steals a squirrel killed by a wolf

• A bobcat kitten learns to stalk both mice and snakes

• A group of squirrels feed on abundant acorns

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Which two species of bird would have the greatest amount of competition? (Choose 2.)

• A

• B

• C

• D

• E

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Competition in an ecosystem occurs when

• animals get bored.

• more than one individual or population in an ecosystem relies (needs) the same limited resource.

• there is more than enough of a resources for every living organism.

• resources are unlimited.

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Trapping has severely reduced the population of rabbits in an ecosystem, as shown in the bar graph below. What is the most likely effect this will have on other organisms?

• The hawk population will increase rapidly and the rabbit population will decrease rapidly.

• The snake population will decrease rapidly and the grass population will increase rapidly.

• The grass population will decrease rapidly and the snake population will increase rapidly.

• The grass, rabbit, snake, and hawk populations will all decrease rapidly.

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Hawks and owls eat the same type of food and struggle with one another to get their food. What is this an example of?

• Competition

• Biotic factor

• Symbiosis

• Population

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Organism X feeds mainly on small fish, amphibians, and reptiles. With which organism is organism X most likely to compete?

• Great blue heron

• Mallard

• Pied-billed grebe

• Great egret

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