Review (BIO) Quiz: U 3 Concept 3 - Energy Through the Ecosystems

Autotrophs differ from heterotrophs because they

• Do not require oxygen to live
• Make carbon dioxide as a product of using food
• Make their own food from carbon dioxide and water
• Utilize oxygen to burn food

Primary producers are organisms that

• Consume plant and animal remains and other dead matter.
• Obtain energy by eating only plants.
• Rely on other organisms for their energy and food supply.
• Use energy they take in from the environment to convert inorganic molecules into complex organic compounds.

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How do chemosynthetic organisms get their energy?

• Directly from the sun
• From eating primary producers
• From inorganic chemicals like hydrogen sulfide
• From eating organisms that were once alive

The series of steps in which a large fish eats a small fish that has eaten algae is a

• Biomass pyramid
• Food chain
• Food web
• Trophic level

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Which of the organisms is a decomposer?

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Which of the organisms is an autotroph?

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• Option 4

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The following organisms make up a food chain: algae→fish→bear. If you were to place the bear into the trophic pyramid in the illustration, the bear would go on level _____ and have ________ amount of energy available to it.

• A; the least
• C; the least
• A; the greatest
• B; an intermediate

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The figure shows a trophic pyramid for an ecosystem. What happens to the amount of energy in the pyramid as it moves up through the different levels?

• Energy increases by 10% each level.
• Energy decreases by 90% each level.
• Energy decreases by 10% each level.
• Energy increases by 90% each level.

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According to the food web in the illustration, the insectivorous birds would be classified as

• Carnivores
• Decomposers
• Herbivores
• Omnivores

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Look at the food web in the illustration. What would be a direct impact of an increase in the amount of toads in the ecosystem

• An increase in the population of predaceous insects
• A decrease in the population of snakes
• An decrease in the population of insectivorous birds
• A decrease in the rabbit population

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