Module c Unit 1 Lesson 3 Matter and Energy In Ecosystems review

The image shows one type of decomposer. Which statement describes the role of decomposers in a food web?

• Decomposers are not necessary in a food web.

• Decomposers break down matter so plants can use it.

• Decomposers create energy by producing their own food.

• Decomposers store matter and energy until it is needed in an ecosystem.

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Producers and consumers are both pictured in a diagram of a food web. Which statement best describes how they differ from one another?

• A. Consumers produce all the energy they need.

• B. Consumers eat only animals, and producers eat only plants.

• C. Producers eat living organisms, and consumers eat organisms that have died.

• D. Consumers obtain energy by eating food, and producers obtain energy from sunlight.

What is the primary role of decomposers in a food web?

• to control the population of producers and consumers

• to compete with producers for energy and other resources

• to provide a source of energy for the producers in the ecosystem

• to recycle energy and materials from dead producers and consumers

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Different grasses are observed in a microhabitat in a schoolyard. Why is grass an essential part of a healthy ecosystem?

• It is a producer that is a necessary part of the diet of most consumers.

• It is a consumer that feeds off other organisms living in the area.

• It is a decomposer that converts matter into a form that other organisms can use.

• It makes up the last level of a food web, helping recycle carbon in the habitat.

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A student is identifying food chains in a diagram of a food web. Which of these organisms might be a consumer?

• frog

• water lily

• redwood tree

• athlete’s foot fungus

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According to the food web, which organism is a producer in the mangrove swamp?

• crabs

• crustacea

• large fish

• mangrove leaf

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If there was a decrease in the butterfly population, how might the food chain be affected?

• The heron population would decrease.

• The population of flower's nectar would decrease.

• The frog populations would increase.

• The flower's nectar and frog populations would decrease.

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A biologist uses the terrarium shown to model the interactions of plants and animals in a forest ecosystem. What is one benefit of using this model to study organism interactions?

• It allows for direct observation of all natural behaviors.

• It it easier to gather data.

• It eliminates the need for field studies.

• It ensures all variables are accounted for.

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A biologist uses the terrarium shown to model the interactions of plants and animals in a forest ecosystem. Identify one limitation of using this model to study organism interactions.

• Not all factors of an ecosystem are present

• Accurate representation of natural conditions

• Unlimited resources available

• Exact replication of ecosystem dynamics

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Based on the carbon cycle, hypothesize how the combustion of fossil fuels affects the amount of carbon dioxide in the ocean.

• It increases the amount of carbon dioxide in the ocean.

• It decreases the amount of carbon dioxide in the ocean.

• It has no effect on the amount of carbon dioxide in the ocean.

• It stabilizes the amount of carbon dioxide in the ocean.

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