Retake Quiz 2

What is an invasive species?

• A species that is continually expanding its habitat

• Any species that survives and thrives in its new environment

• A non-native species whose introduction to an area has caused economic or ecological harm

• An exotic species that is living outside of its native environment

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The flathead catfish is an invasive predatory species of fish. What would be the effect of the introduction of the flathead catfish on the native fish in the rivers of the United States?

• The populations of native fish would become extinct.

• The populations of native fish would increase.

• The populations of native fish would decrease.

• The populations of native fish would remain unaffected.

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An invasive fish species that feeds on native plants is introduced in the rivers of the United States from another country. The data shows the changes in the population of the species. How will the invasive fish species most likely affect the ecosystem?

• It will increase the water quality of the river.

• It will decrease the quantity of water in the river.

• It will lead to a decrease in native aquatic animals.

• It will lead to an increase in native aquatic plants.

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A flea lands on a cat and begins to feed. The flea harms the cat by biting its skin, sucking its blood, and causing it to itch. The flea, however, gets food and a warm home. What type of interaction occurs between the flea and the cat?

• commensalism

• parasitism

• competition

The spider web does not affect the Impala, but the spider benefits. What type of relationship is this?

• parasitism

• mutualism

• commensalism

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What abiotic factors can be found in a desert biome?

• little water, high temperature, and sandy soil

• small shrubs, large, woody trees, and sandy soil

• snakes, little water, and large, woody trees

• small shrubs, snakes, and scorpions

Zebra mussels, an invasive species carried accidentally on ships from Russia to North America, feed and occupy the same habitat as native unionoid mussels. The graph shows the population trends of native unionoid and zebra mussels over several years. Which conclusion can be inferred from the data?

• Native unionoid mussels are in danger of becoming extinct due to the introduction of zebra mussels.

• Native unionoid and zebra mussels are both in danger of becoming extinct due to competition for resources.

• Native unionoid mussels have outcompeted the zebra mussels, resulting in an increase in their population.

• Native unionoid and zebra mussels are coexisting, resulting in an increase in both of the populations.

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Brown Tree snakes were accidentally carried to the island of Guam by the cargo bays of military planes after World War II. Brown tree snakes prey upon birds. There are no natural predators of brown tree snakes in Guam. Which of the following most likely happened as a result of the arrival of the brown tree snakes in Guam?

• Forest biodiversity increased.

• Many bird populations decreased.

• No new bird species arrived in the area.

• All reptile species had an increase in population growth.

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The image shows an energy pyramid. Which level of the energy pyramid has the most energy?

• level R

• level S

• level T

• level U

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The Egyptian plover bird hops into the open mouth of the Nile crocodile and eats away parasites. The bird leaves unharmed from the crocodile’s mouth. What type of ecological relationship exists between the two organisms?

• competition

• cooperation

• mutualism

• parasitism