Unit 3: Ecosystem Interactions and Energy Flow

A food chain is?

• Overlapping food chains in an ecosystem.
• The amount of energy that moves from one feeding level to another in a food web.
• A series of events in which one organism eats another and obtains energy.
• biotic and abiotic factors in an area.

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Which one is NOT an example of a decomposer?

• mushroom
• leaves
• mold
• worm

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Grass is considered a ...

• consumer
• producer
• decomposer
• composers

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A consumer gets energy by doing what?

• Making it themselves.
• Breaking down biotic wastes and dead organisms and returning raw materials to the ecosystem.
• Soaking it up from the ground.
• Feeding on other organisms.

Name the tertiary consumer?

• snake
• fungi
• hawk
• mouse

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Energy pyramids ...

• help SDG&E

• models the transfer of energy between levels.

• models energy in people

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What is biomagnification?

• increased concentration of chemicals that enter and move up a food chain.

• increased concentration of energy in a food chain.

• increased concentration of species in a food chain.

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Which kind of organism is an autotroph?

• consumer

• producer

• decomposer

• herbivore

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Which organisms are heterotrophs?

• photosynthesizers

• producers

• consumers

• plants

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Why are mushrooms important to the food chain?

• They recycle nutrients into the ecosystem.

• They produce food energy for other living things.

• They recycle oxygen into the atmosphere.

• They consume excess herbivores in the ecosystem.

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