6.L.2 Plants and Food Chains

How do decomposers contribute to the growth of plants?

• They draw fertilizers from the soil so plants can use them.

• They use sunlight to produce food that plants use for energy.

• They break down organic compounds into simple nutrients that plants can use.

• They build complex molecules that plants and primary consumers use for energy.

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From which source do most living organisms obtain energy?

• air

• soil

• sunlight

• water

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What would most likely happen within an ecosystem if there was a decrease in sunlight?

• Consumers would no longer decompose.

• Consumers would outcompete producers.

• Producers would provide less energy to consumers.

• Producers would release more energy to consumers.

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Which choice best shows how energy moves through a food chain?

• consumer → producer → decomposer

• decomposer → consumer → producer

• producer → consumer → decomposer

• producer → decomposer → consumer

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Why is photosynthesis essential for a plant’s survival?

• It creates oxygen.

• It gives the plant its color.

• It makes sugar that is used for energy.

• It helps the plant release more energy.

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Which statement best describes food webs and food chains?

• All food webs in an ecosystem are linked together in a food chain.

• All food chains in an ecosystem are linked together in a food web.

• A food chain shows only primary consumers, while a food web shows only producers.

• A food chain represents feeding relationships, while a food web represents mating relationships.

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What will most likely occur in a deer population when there is more food than usual?

• The deer will reproduce more often.

• The deer will become diseased and die.

• The deer will migrate to another habitat.

• The deer will depend less on plants for food.

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What would happen to the consumer population of an aquatic ecosystem if the producer population decreased?

• The consumer population would increase.

• The consumer population would decrease.

• The consumer population would remain the same.

• The consumer population would increase rapidly and then decrease.

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In an ecosystem, beetles eat grain and lizards eat the beetles. Based on these relationships, which statement is true?

• Beetles are producers.

• Beetles are carnivores.

• Lizards are consumers.

• Lizards are decomposers.

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Which statement best describes the role of producers in an ecosystem?

• Producers consume energy from plants.

• Producers convert the sun’s energy into glucose.

• Producers make minerals for all organisms to use.

• Producers recycle matter that organisms release as waste.

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