Understanding Energy Flow in Ecosystems

What is the primary source of energy for most ecosystems?

• The Moon

• The Sun

• The Earth’s core

• Wind

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DOK Level 1: Recall

Which of the following best describes a primary consumer in a food chain?

• An organism that produces its own food

• An organism that eats primary producers

• An organism that eats secondary consumers

• An organism that decomposes organic material

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DOK Level 1: Recall

In an energy pyramid, which level contains the most energy?

• Tertiary consumers

• Secondary consumers

• Primary consumers

• Producers

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DOK Level 1: Recall

Explain why energy transfer between trophic levels is not 100% efficient.

• Energy is lost as heat during metabolic processes

• Energy is destroyed during transfer

• Energy is converted into matter

• Energy is gained during transfer

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DOK Level 2: Skill/Concept

Which of the following organisms would be considered a secondary consumer?

• Grass

• Rabbit

• Snake

• Hawk

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DOK Level 1: Recall

Describe the role of decomposers in an ecosystem.

• They produce energy for primary consumers

• They break down dead organisms and recycle nutrients

• They are at the top of the energy pyramid

• They consume primary producers

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DOK Level 2: Skill/Concept

What percentage of energy is typically transferred from one trophic level to the next?

• 1%

• 10%

• 50%

• 100%

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DOK Level 1: Recall

Identify the correct sequence of trophic levels in a food chain starting from the base.

• Secondary consumers, primary consumers, producers

• Producers, primary consumers, secondary consumers

• Primary consumers, producers, secondary consumers

• Producers, secondary consumers, primary consumers

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DOK Level 1: Recall

Explain why the biomass of producers is greater than the biomass of tertiary consumers in an ecosystem.

• Producers have more energy available to them

• Tertiary consumers are more efficient at energy use

• Producers are at the top of the energy pyramid

• Tertiary consumers produce their own food

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DOK Level 2: Skill/Concept

Which of the following best explains the concept of an energy pyramid?

• It shows the number of organisms at each trophic level

• It illustrates the flow of energy through different trophic levels

• It depicts the physical size of organisms at each level

• It represents the genetic diversity within an ecosystem

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DOK Level 2: Skill/Concept