Food Chains and Food Webs

What is a food chain?

• A path that shows who eats whom in a habitat

• A diagram of interconnections between organisms

• The initial source of energy for all living things

• The top predator in a habitat

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What is the initial source of energy for nearly all living things?

• The sun

• Grass

• Zebras

• Lions

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What organism begins the food chain by utilizing energy from the sun to make its own food?

• Grass

• Zebra

• Lion

• Decomposers

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What do the arrows in a food chain represent?

• The flow of energy

• The flow of materials

• The flow of waste materials

• The flow of heat

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In a food chain, where does the energy always flow?

• From the food to the feeder

• From the feeder to the food

• From the sun to the grass

• From the decomposers to the top predator

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What happens to the energy between each step in a food chain?

• It is lost

• It is gained

• It is multiplied

• It is shared equally

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How is energy lost in a food chain?

• As heat during respiration

• As waste materials

• As feces

• All of the above

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What is a food web?

• A diagram of interconnections between lots of organisms

• A single path that shows who eats whom in a habitat

• The top predator in a habitat

• The initial source of energy for all living things

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Why are populations in a food web interdependent on each other?

• Because they all eat the same food

• Because they all rely on the sun for energy

• Because they all have the same predators

• Because they all have different predators

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What happens if one species goes extinct in a food web?

• It has no effect on the system

• It affects the entire system with predictable results

• It affects the entire system with unpredictable results

• It only affects the species that preyed upon it

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