7B Ecosystems & Popualtions

Three bird species share a habitat. Bird A eats insects and plant seeds. Bird B drinks flower nectar. Bird C eats plant seeds.

A drought occurs in their habitat, and that season’s plants are wiped out entirely. What is the likely outcome for each type of bird?

• Bird A survives; both birds B and C die.

• Bird B survives; both birds A and C die.

• Bird B survives; either bird A or bird C dies, and the other survives.

• Bird A survives; either bird B or bird C dies, and the other survives.

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An increase in which of the following could increase the long-billed curlew population?

• grassland habitats

• forest habitats

• pesticide use

• milkweed

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Long-billed curlews eat many different kinds of insects, including grasshoppers, as a source of food.  It has been shown that pesticide use kills many of these insects. How would you expect an increase in pesticide use to affect to the population of long-billed curlews in the same area?

• It would decrease.

• It would not be affected.

• It would stay the same.

• It would increase.

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How might bird populations on mountainsides respond to a warming climate?

• The range shifts uphill over generations.

• There is not likely to be an effect based on a warming climate.

• Their eggs will hatch later.

• The range shifts downhill over generations.

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What happened to North American coastal waters when the great white shark population decreased?

• The ray population increased.

• The clam population increased.

• The oyster population increased.

• The scallop population increased.

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Which organism is most responsible for the decrease in the great white shark population?

• humans

• rays

• oysters

• scallops

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Climate change is primarily driven by

• fossil fuel burning.

• mining.

• photosynthesis.

• deforestation.

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Hunting can be used to combat

• invasive species.

• climate change.

• deforestation.

• pollution.

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Fertilizer from agriculture flows into the ocean. What organism may directly benefit from this runoff?

• algae

• fish

• dolphins

• corals

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Emperor penguins breed on shelves of sea ice in the winter. By spring, the chicks have developed waterproof plumage and are ready to swim in the cold ocean waters. What effect might a warming climate have on the penguins? 

• The sea ice melts before the chicks are ready to swim.

• The sea ice freezes earlier in the winter, shifting the breeding schedule.

• The sea ice melts later in the season, and the penguins have to travel farther to find food.

• The chicks grow faster because of the warming temperature.

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