NGSS.MS-LS2-1

I am conducting an experiment to determine if the amount of oxygen in the water affects the fish population?  What is the dependent variable?

• the number of the fish population
• amount of oxygen
• amount of water

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NGSS.MS-LS2-1

If plants receive more water, the number of leaves will increase. 
This is an example of 

• Testable Question
• Hypothesis
• Variables
• None of the above

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NGSS.MS-LS2-1

What is the relationship between oxygen in water and plankton abundance?

• As oxygen levels increase, plankton populations increase.
• As oxygen levels increase, plankton populations decrease.
• As oxygen levels increase, phytoplankton populations increase but zooplankton populations decrease.
• There is no relation between plankton abundance and oxygen content.

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NGSS.MS-LS2-1

This describes the number of organisms in an area relative to the amount of space available.

• Population
• Population Density
• Carrying Capacity

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NGSS.MS-LS2-1

If a disease destroying barley plants swept through an ecosystem, what would happen to the bird population that eat barley plants?

• The bird population would stay the same

• The bird population would infinitely increase

• The bird population would decrease

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NGSS.MS-LS2-1

How do limiting factors in an ecosystem help keep the ecosystem sustainable?

• They limit the amount of change to the ecosystem

• They limit the growth of populations within the ecosystem

• They limit the factors that can affect the ecosystem

• They limit how fast populations change within the ecosystem

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NGSS.MS-LS2-1

A student wants to investigate competition between two organisms. For the investigation, it is most important that the student should choose organisms that –

• reproduce at a faster rate.

• are both active during the night.

• have the different adaptations.

• require the same resources.

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NGSS.MS-LS2-1

The milkweed plant serves an important role in the life cycle of the monarch butterfly. Adult monarchs lay their eggs on milkweed, and then caterpillars eat that same plant during their development. Based on the relationship between monarchs and milkweed, which of the following trends would be predicted when looking at data on the populations of these two organisms?

• A decrease in the milkweed population will cause a decrease in the monarch butterfly population.

• When the milkweed population decreases, the monarch butterfly population stays the same.

• A decrease in the milkweed population will cause the monarch population to increase.

• When the monarch population increases, the milkweed population stays the same.

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NGSS.MS-LS2-1

In the food web above, a large decrease in the number of rats will cause ____.

• an increase in the number of ants, tarantulas, and snakes

• an increase in the number of snakes, coyotes, and hawks

• a decrease in the number of snakes, coyotes, and hawks

• a decrease in the number of cacti and sagebrush plants

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NGSS.MS-LS2-1

Scientists have been studying the size of three populations in a region. In this ecosystem, lions eat wild pigs, and wild pigs eat frogs. The data showed that all three populations were stable. Then the frog population decreased suddenly. What will likely happen to the size of the wild pig population as a result?

The size of the wild pig population will . . .

• increase

• stay the same

• decrease

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NGSS.MS-LS2-1