CCA Review 2: Populations & Human Impact

The cardinal is a type of bird. Which of the following would increase the size of a population of cardinals in a forest?

• an increase in the birth rate of cardinals

• an increase in the death rate of cardinals

• increased emigration of young cardinals from the forest ecosystem

• increased immigration of cardinal predators into the forest ecosystem

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NGSS.MS-LS2-4

The green sea turtle is an endangered species. The graph below shows the estimated number of green sea turtle nests on a beach in Costa Rica between 1970 and 2003. Based on the information in the graph, which of the following is the most likely way humans affected the green sea turtle population during this time?

• Humans passed laws preventing the collection of green sea turtles.

• Humans collected more green sea turtle eggs for scientists to study.

• Humans passed laws protecting animals that eat green sea turtle eggs.

• Humans built more hotels on the beach where green sea turtles build nests.

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NGSS.MS-LS2-4

The graph below shows the changes in the population size of a mammal species introduced onto an isolated island in 1957. Which of the following conclusions is best supported by the data?

• Every year, more individuals were born than died.

• A predator of this mammal was removed from the island in 1990.

• The population decreases were the result of low immigration rates.

• In the 1980s, the mammal’s population size stayed around its carrying capacity.

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Which of the following statements best explains why introduced species often threaten native species in an ecosystem?

• Introduced species often have less genetic diversity than native species.

• Introduced species often lack natural predators in their new environment.

• Introduced species often form mutualistic relationships with native species.

• Introduced species often cause short-term droughts in their new environment.

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NGSS.MS-LS2-4

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The oceans have become increasingly acidic in recent years as the water absorbs more and more carbon dioxide from the atmosphere. This increased acidity interferes with the ability of corals to maintain their skeletons. In addition, an increase in water temperatures worldwide is causing coral bleaching, another condition that threatens the health of coral reefs. Based on this information, which of the following would most improve the health of coral reefs?

• reducing the use of fossil fuels

• eliminating nuclear power plants

• removing more natural gas embedded in rocks

• replacing offshore oil drills with onshore oil drills

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NGSS.MS-ESS3-4

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A population of grasshoppers increased in size over a five-year period. Which of the following best explains this increase?

• The death rate was higher than the birth rate, and the immigration rate was equal to the emigration rate.

• The emigration rate was higher than the birth rate, and the immigration rate was equal to the death rate.

• The immigration rate was higher than the death rate, and the emigration rate was equal to the birth rate.

• The emigration rate was higher than the immigration rate, and the birth rate was equal to the death rate.

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NGSS.MS-LS2-4

The zebra mussel is a highly invasive species that was accidentally introduced to the Great Lakes region of the United States in the 1980s. The map below shows the distribution of zebra mussels in 2010. What is the primary reason the large-scale spread of zebra mussels concerns scientists?

• Zebra mussels are a freshwater species.

• Zebra mussels are a desired food for humans.

• Zebra mussels are eaten by some fish and birds.

• Zebra mussels outcompete native mussel species.

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NGSS.MS-LS2-1

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The graph below shows changes in the size of a mammal population in the early 1900s. Which of the following explanations is the most likely reason for the dramatic population change between 1915 and 1925?

• a decrease in the birth rate of the mammal population

• an increase in the death rate of the mammal population

• a large decrease in the number of the mammal’s predators

• a large increase in snowfall for several months in the mammal’s habitat

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NGSS.HS-LS2-1

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Kudzu is an invasive plant that can grow as much as one foot in a day. A partial food web for an ecosystem is shown. Suppose kudzu invades this ecosystem. Select three organisms that would most likely compete with kudzu in this ecosystem

• Oak tree, grass, wildflower

• Deer, squirrel, butterfly

• Oak tree, deer, coyote

• Butterfly, swallow, hawk

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NGSS.MS-LS2-1

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Select all of the processes the biological processes that release carbon into the atmosphere.

• Combustion

• Respiration

• Decomposition

• Photosynthesis

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NGSS.MS-ESS3-4