ENERGY FLOW

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

• decreased primary consumer populations only

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NGSS.MS-LS2-1

NGSS.MS-LS2-2

NGSS.MS-LS2-3

NGSS.MS-LS2-4

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

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-LS2-3

Which food chain best describes how energy flows in an urban ecosystem that includes hummingbirds?

• cats → hummingbirds → insects → plants

• cats → insects → hummingbirds → plants

• plants → insects → hummingbirds → cats

• plants → cats → hummingbirds → insects

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NGSS.MS-LS2-3

Which sequence correctly describes the flow of energy between organisms in the marine food web?

• from seals to penguins to krill

• from whales to krill to small fish

• from sea birds to seals to penguins

• from small fish to penguins to seals

Tags

NGSS.MS-LS2-3

Which level includes organisms that derive their energy from a source different from the others?

• A

• B

• C

• D

Tags

NGSS.MS-LS2-3

Which of the following is the best title for the diagram shown?

• Ecological Diversity

• Evolution through Natural Selection

• The Flow of Energy in a Community

• An Interactive Food Chain

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NGSS.MS-LS2-3

A stable forest ecosystem would not contain

• more consumers than producers

• nutrients being cycled

• carbon dioxide

• scavengers

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NGSS.MS-LS2-3

NGSS.MS-LS2-4

Which level includes organisms that receive their energy from level C?

• A

• B

• C

• D

Tags

NGSS.MS-LS2-3

The trophic levels of the energy pyramid show that

• there is a great amount of energy gained as it travels up the energy pyramid.

• the same amount of energy is available at every level of the energy pyramid.

• energy is not transferred between organisms in an ecosystem.

• there is a great amount of energy lost as it travels up the energy pyramid.

Tags

NGSS.MS-LS2-3