L.2.3 EOG Review #15

A rabbit depends on various plants in an ecosystem to survive. Which would most likely happen if a drought decreased the plant population?

• The rabbit population would increase.

• The rabbit population would decrease.

• The rabbit population would remain the same.

• The rabbit population would increase, then decrease quickly.

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This diagram shows a simple ocean food chain.

algae → fish → seal

Which will most likely occur if the fish population decreases?

• The algae and seal populations will increase.

• The algae and seal populations will decrease.

• The algae population will increase, and the seal population will increase.

• The algae population will increase, and the seal population will decrease.

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The diagram below is an aquatic food chain.

Which will most likely occur if there is overfishing and a loss of clams?

• The amount of algae would increase and the number of bass would increase.

• The amount of algae would decrease and the number of bass would increase.

• The amount of algae would increase and the number of bass would decrease.

• The amount of algae would decrease and the number of bass would decrease.

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This food chain shows organisms in a classroom aquarium.

Which would benefit if the snail living in the aquarium were removed?

• algae

• crayfish

• fish

• plant

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The diagram below shows part of a river food web.

Which change would MOST likely reduce the number of both large roach fish and steelhead fish?

• an increase in the amount of algae

• an increase in the number of small invertebrates

• a decrease in the number of predatory invertebrates

• a decrease in the number of young stickleback fish

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The diagram below shows part of a lake food web.

Many tourists and locals have been fishing in the same spot in this lake for a long period of time. How will the organisms in this food web MOST likely be affected if this fishing continues?

• The frog population will have fewer dragonflies to eat.

• The dragonfly population will have more beetles to eat.

• The pelican population will have less herring to eat.

• The mayfly population will have less algae to eat.

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The diagram below shows a stream food web.

The number of stonefly nymphs in a large stream increased over the last year. How will this MOST likely affect this food web?

• The brook trout population will increase, and the fly larva will decrease.

• The fly larva population will increase, and mayfly nymph population will decrease.

• The kingfisher population will decrease, and the brook trout population will increase.

• The mayfly nymph population will decrease, and the algae population will increase.

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The diagram below shows a marine food web.

Changing ocean temperatures have led to a large decrease in the number of horseshoe crabs. Which effect will MOST likely occur next?

• The diamondback turtle and grackle populations will decrease

• The striped bass and plankton populations will decrease.

• The razor clam population will increase.

• The sanderling population will increase.

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The diagram below shows part of a river food web.

A disease reduces the number of young salmon in a river. Which populations will MOST likely increase as a result?

• trout and eagle

• algae and trout

• otter and sculpin

• sculpin and algae

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The diagram below shows part of a river food web.

The amount of algae in a river increases over time. How will this MOST likely affect this food web?

• There will be more trout for the bears to eat.

• There will be more sculpins for the snails to eat

• There will be fewer clams for the raccoons to eat.

• There will be fewer minnows for the sculpins to eat.

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