Ecosystem

How would a large increase in the salinity of an estuary most likely affect the ecosystem of the estuary?

• All organisms would die

• All organisms would continue to live as they now do.

• The number of salt-tolerant organisms would increase, and the number of salt-intolerant organisms would decrease.

• The number of salt-intolerant organisms would increase, and the number of salt-tolerant organisms would decrease.

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NGSS.MS-LS2-1

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Which would indicate the water in a lake is not safe for drinking?

• many varieties of fish in the lake

• high dissolved-oxygen levels in the lake

• cold water temperature of the lake

• high turbidity levels in the lake

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NGSS.MS-PS1-2

In some environments, wolves prey on deer for their source of food. If all of the wolves were taken from the environment, what would most likely happen to the deer population?

• The deer population would increase and begin to compete for food.

• The deer population would become larger and healthier animals.

• The deer population would decrease, because there would be an increase in disease.

• The deer population would change color, because they would not have to hide from wolves.

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How are mutualism and parasitism different?

• Both organisms benefit in mutualism, while in parasitism only one organism benefits at the other’s expense.

• Both organisms benefit in parasitism, while in mutualism only one organism benefits at the other’s expense.

• Both organisms benefit in mutualism, while in parasitism one organism benefits, and the other is neither harmed nor benefits.

• Both organisms benefit in parasitism, while in mutualism one organism benefits, and the other is neither harmed nor benefits.

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NGSS.MS-LS2-2

Which best explains why all of the Earth’s freshwater is not available for human use?

• Most of Earth’s freshwater is only in lakes.

• Most of Earth’s freshwater is underground.

• Most of Earth’s freshwater is still in the water cycle.

• Most of Earth’s freshwater is frozen water.

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NGSS.MS-ESS2-4

How can upwellings improve fishing for ocean fishermen?

• They cause the ocean water to get warmer.

• They cause ocean currents to remain calm.

• They bring nutrients from the cold, deep ocean waters.

• They bring ocean currents from the equator.

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NGSS.MS-LS2-1

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If a lake has excess levels of phosphates and nitrates in its water, what will most likely result?

• The temperature of the lake water will decrease

• The turbidity levels of the lake will decrease

• The dissolved-oxygen levels in the lake will increase

• The growth of algae in the lake will increase

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NGSS.MS-LS2-1

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The table shows the food choices for two species of birds.

Which will most likely happen to Questors as a result of Wood Plaxers migrating to their habitat?

• The Questors will compete with the Wood Plaxers for food resources.

• The Questors will be forced to fly to a different habitat.

• The two species will become extinct.

• The two species will coexist with no competition.

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NGSS.MS-LS2-1

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What happens to most of the energy as it moves throughout a food web?

• It is changed into light energy

• It is changed into heat energy

• It is changed into mass

• It is changed into decomposers

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NGSS.MS-LS2-3

Where do plants get the food they need for energy?

• They absorb it directly from the sun.

• They absorb it directly from the soil.

• They produce it during photosynthesis

• They receive it from atmospheric gases

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NGSS.MS-LS1-6

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