Disruptions in Ecosystems Review Quiz

If these organisms were arranged in a food pyramid, which organisms would have the least amount of total energy available?

• wolves

• insects

• lizard

• bushes

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Which populations would increase most if the insects were eliminated?

• decomposers

• producers

• primary consumers

• secondary consumers

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Which of the following populations begins the flow of energy through the food web?

• wolves

• insects

• lizards

• bushes

Use the food web to answer the question.

A food chain is one part of a food web. Which list is part of the food web shown ?​

• diatoms => fish => leopard seal => orca

• diatoms => krill => fish => great white shark => orca

• copepods => diatoms => krill => fish => leopard seal => orca

• orca => leopard seal => squid => copepods => diatoms

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​One year, a parasite infects squirrels and significantly reduces the squirrel population.

What effect is a decrease in the population of squirrels most likely to have on the hawk population?

• Hawk population will increase significantly.

• Hawk population will decrease significantly.

• Hawk population will not change significantly.

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​One year, a parasite infects squirrels and significantly reduces the squirrel population.

What effect is a decrease in the population of squirrels most likely to have on the salamander population?

• Salamander population will increase significantly.

• Salamander population will decrease significantly.

• Salamander population will not change significantly.

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The wolf and moose populations on Isle Royale National Park in Michigan have been studied for many years because the relationship between the populations are so unique. The graph below shows the population of wolves and moose in Lake Superior over the last 30 years.

Based on the data above, what is the best explanation for the decline in the wolf population between years 20 & 25?

• The moose are prey for the wolves and a decrease in their population meant less resources for the wolves

• The moose and wolves compete for resources and an increase in the moose population led to more competition.

• The moose and wolves have a mutualistic relationship and an increase in one leads to an increase in the other.

• The moose and wolves have a commensalistic relationship and a decrease in the moose population had a harmful effect on the wolves.

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Grizzly bears, black bears, eagles, and ravens are scavengers in the Yellowstone ecosystem. Based on the information, which statement explains how the reintroduction of wolves has most likely affected the populations of scavengers?

• Scavenger populations likely decreased because wolves prey on scavengers.

• Scavenger populations likely decreased because wolves and scavengers compete for the same resources.

• Scavenger populations likely increased because wolves provide a food source for scavengers.

• Scavenger populations likely increased because wolves provide habitat for scavengers when the wolves create and abandon their dens.

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The picture shows the stages of development in an ecosystem after a forest fire. This is an example of __________.

• Primary succession

• Climate change

• Limiting factors

• Secondary succession

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The first species to populate an area where primary succession is taking place are called

• secondary species

• primary species

• pioneer species

• succession species