Understanding Food Chains and Ecosystems

Why do living things need to eat?

• To make friends

• To grow, move, and stay warm

• To play video games

• Because they are bored

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What do plants need to grow and repair themselves?

• Rocks

• Sunlight, water, and carbon dioxide

• Vase

• Pizza

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What is a food chain?

• A restaurant chain

• A type of jewelry

• A model that shows how energy flows between living things

• A series of fast-food outlets

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What starts the energy in a food chain?

• The Sun

• Plants

• The Moon

• Electricity

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What role do decomposers play in an ecosystem?

• They cook food

• They break down matter and provide nutrients for plants

• They create water

• They make sunlight

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What happens if a species in an ecosystem is lost?

• More food for humans

• Nothing changes

• It can shake up the whole ecosystem

• It rains more

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Why are food webs described as delicate?

• Because they are made of spider silk

• Because they can easily be affected

• Because they are invisible

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How do spider monkeys help the rainforest grow?

• By sleeping

• By scattering seeds

• By swinging through branches

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What is the main reason ecosystems can get out of balance?

• Too much sunlight

• Loss of species or habitat changes

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