Unit 2 Section 7 Test Retake

Tennessee is using many strategies to try and control the populations of these invasive carp species. Four strategies are shown. Some strategies Tennessee is using to control carp populations make sense to use in areas where carp populations have been observed. Other strategies make more sense to use in areas where carp have not yet become established. Which two strategies would be best for areas where carp are already established?

• Prevention

• Harvesting

• Predators

• Blocking

• Transporting

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Hemlock is a species of evergreen tree that provides many benefits to an ecosystem. In Tennessee, hemlock trees provide shelter for over 90 species of birds and mammals. Birds use hemlock trees for food sources and nesting sites. Shade from hemlock trees helps to keep the temperature of streams constant, and the roots of the trees help to keep the shores of lakes and rivers stable. Native to Eastern Asia, the hemlock woolly adelgids spread when they are carried by mammals, birds, and winds. The shaded region on the map shows the counties in which hemlock woolly adelgid has been detected. Which statement BEST describes the effect of hemlock woolly adelgids on biodiversity?

• Biodiversity increases because ecosystem quality improves.

• Biodiversity decreases because ecosystems have less space.

• Biodiversity increases because ecosystems contain more species.

• Biodiversity decreases because ecosystem resources become less stable.

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Native to Europe and Asia, carp fish have been introduced into North America, where they have become invasive. Silver carp and Bighead carp have migrated into Tennessee waters using the Kentucky and Barkley dam. Populations of these carp have been observed throughout the state, including the Tennessee and Cumberland rivers. Both Silver carp and Bighead carp feed on phytoplankton and zooplankton. Scientists have observed that the introduction of these fish into Tennessee waters has greatly affected the food chains in the ecosystems. How do invasive carp MOST LIKELY affect native primary consumers?

• Primary consumer populations increase because the carp increase the population of zooplankton.

• Primary consumer populations increase because the carp provide additional food sources.

• Primary consumer populations decrease because the carp compete with them for food.

• Primary consumer populations decrease because the carp are predators to them.

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Which invasive species has significantly impacted native fish populations in Tennessee?

• Asian Carp

• Kudzu

• Emerald Ash Borer

• Hemlock Wooly Adelgid

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What is one major effect of the Asian Carp on native fish populations in Tennessee?

• Increased biodiversity

• Decreased water pollution

• Competition for food resources

• Improved water quality

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What is a potential solution to mitigate the impact of Kudzu on native plant species in Tennessee?

• planting more kudzu

• introducing new types of kudzu to the ecosystem

• increasing water levels

• using herbicides

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Which of the following is a consequence of the Emerald Ash Borer infestation in Tennessee?

• Increased Ash tree population

• Decline in Ash tree population

• Improved soil quality

• Enhanced growth of other tree species

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What is an effective strategy to prevent the spread of invasive species in Tennessee?

• encouraging the trade of exotic plants and animals

• reducing public awareness campaigns

• implementing strict quarantine measures

• promoting the release of non-native species

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Why do the populations of invasive species grow so quickly? 

• invasive species require more energy than other organisms
• invasive species are prey to many animals.
• invasive species have no natural predators.
• invasive species keep the ecosystems in equilibrium.

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Invasive species alter the ecosystem by _____ in number quickly. This leads to _____ food for the native species.

• increasing, less

• increasing, more

• decreasing, less

• decreasing, more

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