6B Unit 5 Lesson 9-15 Organisms and Ecosystems

Which of the following describes a population?

• a bird flying through the trees to its nest.

• all the barcacles living on large rock.

• elephants and zebras foraging for food at the same time

• rain falling on flowers and rocks in a garden.

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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; either bird B or C dies, and the other survives

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

• Bird A survives; both birds B & C die

• Bird B survives; both birds A & C die

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

• forest habitats

• milkweed

• grasslands habitats

• pesticide use

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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?

• their eggs will hatch later

• the range shifts uphill over generations

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

• 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 oyster population increased

• the clam population increased

• the scallop population increased

• the ray population increased

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

• rays

• scallops

• oysters

• humans

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Climate change is primarily driven by.....

• fossil fuel burning

• deforestation

• photosynthesis

• mining

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Hunting can be used to combat

• pollution

• climate change

• deforestation

• invasive species

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

• dolphins

• fish

• algae

• oysters

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