KE REVIEW~ UNIT 8

Which description is the best example of a population?

• all of the red foxes in a forest

• all of the red foxes in every forest

• all of the organisms in a forest

• all of the organisms in every forest

In Pennsylvania, a nonnative plant called stiltgrass out-competes native plants in many forest ecosystems. Which statement best describes how the spread of stiltgrass negatively affects native herbivores?

• Stiltgrass stops the life cycles of native herbivores.

• Stiltgrass reduces the size of the native plant populations.

• Stiltgrass increases the flow of energy through the ecosystem.

• Stiltgrass attracts other nonnative plants to the forest ecosystem.

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

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Which energy transfer most likely occurs between organisms in the food web?

• from owl to fox

• from rabbit to fox

• from sparrow to grass

• from mouse to grasshopper

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NGSS.MS-LS2-2

NGSS.MS-LS2-3

Most of the water on Earth is located in the oceans and has a salinity of about 3.5%. Which statement best explains why rain is fresh water and has a very low salinity?

• When water precipitates from oceans, most of the salt remains in the oceans.

• When water evaporates from oceans, most of the salt remains in the oceans.

• When water precipitates from clouds, most of the salt remains in the clouds.

• When water evaporates from clouds, most of the salt remains in the clouds.

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NGSS.MS-ESS2-1

NGSS.MS-ESS2-4

Scientists observed that the populations of top-level consumers in a particular ecosystem were rapidly decreasing. Further studies revealed that there was also a decline in producer productivity. Which other changes did the scientists most likely observe in the ecosystem?

• increased producer diversity

• decreased population size at all levels

• decreased primary consumer populations only

• increased primary and secondary consumer diversity

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NGSS.MS-LS2-1

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A student listed characteristics of a classroom aquarium ecosystem. Which characteristic is a biotic component of the aquarium ecosystem?

• The water temperature is 23°C.

• The pH of the water is usually between 6.5 and 6.8.

• The ammonia is controlled with a filter that uses two types of bacteria.

• The lighting is supplied by natural sunlight and a fluorescent light bulb.

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NGSS.MS-LS1-5

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Which population description is most likely represented by the graph?

• A population of birds quickly increases but then becomes stable due to limiting factors in the environment.

• A population of mice slowly increases but then fluctuates seasonally as predators raise their young and limit prey populations.

• A population of fish quickly increases in the spring when there is plenty of food but then decreases quickly in the fall when food is limited.

• A population of wolves slowly increases because of limiting factors in the environment but then increases constantly when additional prey migrate into the environment.

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NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which sequence best orders ecological categories from the one with the fewest number of individuals to the one with the greatest number of individuals?

• ecosystem, population, community, biome

• population, community, ecosystem, biome

• biome, population, community, ecosystem

• community, biome, population, ecosystem

A researcher observing an ecosystem describes the amount of sunlight, precipitation, and type of soil present. Which factors is the researcher most likely describing?

• biotic factors in a forest

• biotic factors in a tundra

• abiotic factors in a prairie

• abiotic factors in an ocean

Tags

NGSS.MS-ESS2-4

Energy pyramids describe food and energy relationships within an ecosystem. Which factor most likely limits the number of levels an energy pyramid can have?

• biomass of the top-level organisms

• predation by the top-level organisms

• energy loss between each level of organisms

• chemical energy being decomposed at each level of organisms

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NGSS.MS-LS1-6

NGSS.MS-LS2-3