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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Species Z can successfully share the same environment with the other plants shown because species Z absorbs water ---

• near the soil surface, and species Y absorbs water found deep underground

• near the soil surface, and species Y absorbs water near the soil surface

• found deep underground, and species X absorbs water found deep underground

• found deep underground, and species X absorbs water near the soil surface

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Feral hogs are omnivores that feed on both plants and small animals. Which two types of native organisms do feral hogs most likely compete with for food sources?

• carnivores

• herbivores

• producers

• decomposers

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NGSS.MS-LS2-1

Certain kinds of trees produce a nontoxic chemical that becomes highly toxic when it is exposed to air or soil. How does this chemical help these types of trees compete with plants growing nearby?

• By limiting the amount of water available to the other plants

• By increasing the photosynthesis rates in the other plants

• By suppressing the growth of the other plants

• By attracting herbivores to the other plants

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NGSS.MS-LS2-2

The graph shows the range of water conditions preferred by three species of fish in a certain stream. Water with which of these conditions would cause the most competition for resources among all three species of fish?

• Mild temperatures, some suspended particles, flows at a medium speed

• Mild temperatures, some suspended particles, flows very fast

• Very warm, very clear, and very slow

• Very cold, very clear, and very fast

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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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