Chapter 4 Science Test Ecosystems

During photosynthesis plants give off

• oxygen

• nitrogen

• carbon dioxide

• water vapor

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What does both a food chain and food web have?

• only carnivores

• start with producers

• multiple ways energy flow

• oreo cookies

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What is the source of energy for most plants?

• batteries

• recharging

• sunlight

• animals

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The shortest food chains consist of

• nothing

• two producers

• two consumers

• a producer and a decomposer

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Which describes both a food chain and a food web?

• both must include a carnivore

• both contain multiple ways that energy flows

• both begin with a producer

• both contain only consumers

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The relationship between a crocodile and fish is

• friendly

• symbiosis

• predator and prey

• competition

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Which event would NOT cause an ecosystem to change quickly?

• a lake drying up

• tornado

• earthquake

• hurricane

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Nonnative animal populations can grow rapidly because

• they are all producers

• they have no competition

• they have no predators at first

• they are at the top of the food chain

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What is NOT a part of a food chain?

• producer

• consumer

• decomposer

• composer

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What happens if one part of a food chain is damaged or hurt?

• The rest of the chain continues.

• It affects all the other parts.

• The ecosystem stays the same.

• It is fine and doesn't matter.

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