TEKS 7.10A

Refer to the food web. If the grasses in each ecosystem are attacked and killed by a disease, which ecosystem will most likely survive?

• The prairie ecosystem, because few organisms eat grass.

• The tundra ecosystem, because there is a variety of producers.

• The prairie ecosystem, because there a fewer top predators.

• The tundra ecosystem, because it has more herbivores.

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Which statement below best describes how biodiversity contributes to the sustainability of an ecosystem?

• A. A variety of plant and animal species allows for more survivors of a natural disaster.

• B. Having more species in an ecosystem allows the human population to increase in size.

• C. Low biodiversity reduces the competition for resources, which helps native species survive.

• D. Few species in the ecosystem reduces the likelihood that disease spreads through the ecosystem.

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Students were asked to make a claim supported with evidence to answer the question, "Which ecosystem would be most sustainable if all the grasses died from severe drought?" What claim is valid and supported by the evidence?

• The forest ecosystem is most suitable because there are more top predators.

• The grassland ecosystem is most sustainable because there are fewer organisms that eat grass.

• The forest ecosystem is most sustainable because most of the animals can eat other organisms.

• The grassland ecosystem is most sustainable because there is less competition for food.

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Aluminum is refined from bauxite, which is found in the ground under rainforests. Humans must destroy this habitat to mine the bauxite and make aluminum. This type of habitat destruction will most likely result in ---

• an increase in rainfall

• an increase in number of species

• a decrease in biodiversity

• a decrease in cloud formation

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In the context of natural selection, what does "fitness" refer to?

• The physical strength of an organism

• The ability of an organism to compete for resources

• The ability of an organism to survive and reproduce in its environment

• The speed at which an organism can move

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In an ecosystem, which type of animal would best be described as a secondary consumer?

• Carnivore

• Herbivore

• Omnivore

• Decomposer

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In an ecosystem, which animal would best be described as a secondary consumer?

• A. Rabbit

• B. Grasshopper

• C. Coyote

• D. Human

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An organis that creates nutrients using energy from the sun, is known as a ----

• predator

• scavenger

• herbivore

• producer

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Complete this statement. The more diverse an ecosystem is ----

• the more threatened its populations are

• the more similar the species will be

• the more stable it is

• the few varieties of species are present

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Which of the following is not an example of how biodiversity contributes to the sustainability of an ecosystem?

• Controlling pest species

• Providing potential for medical discoveries

• Creating a limited gene pool for future generations

• Regulating the chemistry of air and water supply

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NGSS.MS-LS2-5