7.10b

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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Based on the table of observations, which ecosystem is likely to be the least sustainable?

• Ecosystem 1, because it has the fewest species

• Ecosystem 2, because it includes both aquatic and terrestrial species.

• Ecosystem 3, because it has few predators.

• Ecosystem 4, because it supports many animals.

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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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List the steps of the scientific method

d

e

f

c

b

a

Communicate results

Draw conclusions

Form a hypothesis

Conduct experiment

Analyze results

Ask a question

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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 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 ----

• A. predator

• B. scavenger

• C. herbivore

• D. producer

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Which of the following situations contributes to the sustainability of an ecosystem

• Increase in biodiversity

• Decrease in biodiversity

• Extinction of a population from the ecosystem

• Removal of many populations of organisms

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