What is the main way energy flows through an ecosystem?

• In a cycle from producers back to themselves

• In a one-way stream from consumers to producers

• In a one-way stream from primary producers to consumers

• In multiple directions, depending on the season

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What are autotrophs?

• Organisms that consume others for energy

• Organisms that recycle nutrients

• Organisms that create energy from sunlight or chemicals

• Top predators in food chains

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NGSS.MS-LS2-3

Which process do photoautotrophs use to create energy-rich compounds?

• Cellular respiration

• Chemosynthesis

• Decomposition

• Photosynthesis

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NGSS.MS-LS1-6

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Which of the following is a chemoautotroph?

• Grass

• Cyanobacteria

• Deep-sea bacteria using hydrogen sulfide

• Shrimp

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NGSS.MS-LS2-3

What do heterotrophs rely on for energy?

• Inorganic molecules

• Other organisms

• The sun directly

• Only plants

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NGSS.MS-LS2-3

Which of the following is NOT a type of heterotroph?

• Carnivore

• Detritivore

• Photoautotroph

• Decomposer

What does each step in a food chain represent?

• A level of digestion

• A trophic level

• A new food web

• A new species

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NGSS.MS-LS1-6

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In the food chain: Grass → Rabbit → Snake → Hawk, what is the snake?

• Primary producer

• Primary consumer

• Secondary consumer

• Tertiary consumer

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NGSS.MS-LS2-3

What does a food web show that a food chain does not?

• Energy loss

• Predator-prey relationships

• One-way energy flow

• Multiple feeding relationships

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NGSS.MS-LS2-3

Why are food webs more realistic than food chains?

• They only include autotrophs

• They exclude decomposers

• Organisms often have multiple food sources and predators

• They always form perfect pyramids

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NGSS.MS-LS2-3