Unit 2: Energy in an Ecosystem

What are decomposers in an ecosystem?

• The make food from sunlight.
• They consume food energy.
• They release food energy back into the ecosystem.
• They do not need food energy.

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Which organism is both a prey and predator?

• Grass
• Owl
• Snake
• Caterpillar

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If an organism uses photosynthesis to make its energy, it is a _____.

• tertiary consumers

• producer

• primary consumer

• secondary consumer

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The sun, water, oxygen, and climate are all examples of _____.

• biotic factors

• abiotic factors

• plants

• producers

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As energy makes its way up the food pyramid only ______ of energy from one organism gets passed on to the next organism.

• 10%

• 20%

• 30%

• 40%

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Barnacles are crustaceans that attach themselves to large marine animals such as whales. The barnacles are transported to new feeding grounds, usually without affecting the whale. This process is an example of which of the following? 

• parasitism
• predation
• commensalism
• mutualism

Each organism has its own role in an ecosystem. Organisms can be producers, consumers, or decomposers. Which of these organisms can be classified as a decomposer? 

• bee
• flower
• mushroom
• turtle

Which type of organism would be in Section 1 of the pyramid?

• Heterotroph
• Producer
• Consumer
• Decomposer

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In which of the following populations is the least energy concentrated?

• plants
• rabbits
• snakes
• hawks

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In which of the following populations is the most energy concentrated?

• plants
• rabbits
• snakes
• hawks

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