4.3 Ecosystems

What is a food web?

• A diagram showing how energy flows through an ecosystem

• A type of spider web

• A map of the stars

• A network of roads

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Who are the producers in a food web?

• Hawks and lions

• Grass, trees, and shrubs

• Snakes and shrews

• Squirrels and rabbits

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What do primary consumers eat?

• Other carnivores

• Producers

• Tertiary consumers

• Rocks and minerals

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Which of the following is a secondary consumer?

• Grasshopper

• Snake

• Tree

• Grass

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What do tertiary consumers eat?

• Primary consumers

• Secondary consumers

• Producers

• Decomposers

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What is the role of herbivores in a food web?

• They produce energy through photosynthesis

• They eat producers

• They eat secondary consumers

• They decompose dead organisms

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What happens if the population of wolves decreases in an ecosystem?

• The grass population decreases

• The deer population may increase

• The ecosystem collapses immediately

• The producers become carnivores

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What is interdependence in a food web?

• Each level of consumer depends on the previous level for food

• All animals eat the same food

• Only producers are important

• Consumers do not affect each other

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What might happen if deer overconsume grass in an ecosystem?

• The grass will grow more

• The wolves will have more food

• The grass will have less room to grow

• The ecosystem will become a desert

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What is an example of a tertiary consumer?

• Rabbit

• Hawk

• Grasshopper

• Squirrel

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