HMH Book C Lesson 3

Which statement describes the role of decomposers in a food web?

• A. Decomposers are not necessary in a food web.

• B. Decomposers break down matter so plants can use it.

• C. Decomposers create energy by producing their own food.

• D. Decomposers are organisms that consume living organisms.

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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.

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

• A. to control the population of producers and consumers

• B. to compete with producers for energy and other resources

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

• D. to recycle energy and materials from dead producers and consumers

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

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

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

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

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

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

• A. frog

• B. water lily

• C. redwood tree

• D. athlete’s foot fungus

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

• A. mold

• B. prawn

• C. pelican

• D. Mangrove leaves

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

• A. The Toad population would decrease.

• B. The population of green plants would decrease.

• C. The toad and snake populations would increase.

• D. The green plants and toad populations would decrease.

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Summarize the carbon cycle.

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

• Involves nitrification, denitrification and ammonification. The combustion of Fossil Fuels adds excess nitrogen to our atmosphere.

• Involves cellular respiration, photosynthesis, and Decomposition . The combustion of Fossil Fuels adds excess carbon to our atmosphere.

• Involves condensation, evaporation, and runnoff. The combustion of Fossil Fuels adds excess water to our atmosphere.

• Involves energy pyramids, food chains, and food webs. The combustion of Fossil Fuels adds excess nutrients to our atmosphere.

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A slug, frog, heron bird, and grass plant are all part of the same food chain.Through which process does energy get into the food chain?Which organisms are consumers in this food chain?Why would there be fewer herons in the ecosystem than slugs? What role do decomposers fit in food chain.

• Grass plants. Slug and grass plant. More energy is available up the energy pyramid. They are not in the food chain.

• Grass plants. Frog and Heron. Less energy is available up the energy pyramid.They bring nutrients back to producers.

• Grass plants. Slug and Frog. The energy available up the energy pyramid is the same. There are no decomposers.

• Grass plants. Heron. More energy is available up the energy pyramid. They bring nutrients back to producers.

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What is this picture showing? what % of energy is available as you go up it? what level makes up the first part of the pyramid?

• Energy Pryamid.10%. producers

• Energy Pyramid. 100%. Consumers

• Matter Pyramid. 10%. Producers

• Matter Pyramid. 100%. Consumers

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