Unit 3 Energy Flow Exam

Grace and Noah are studying a pond ecosystem. Which organisms in the food web are both primary and secondary consumers?

• Cattails

• Bluegills

• Coyotes

• Snakes

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Arjun and Lily are studying a pond ecosystem. If the algae or cattails (producers) are removed in the food web, which of the following changes would most likely occur?

• The entire food web would collapse over time.

• The food web would depend on the decomposers for energy

• The consumers would begin making energy for the food web

• The populations of the remaining organisms in the food web would increase

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Michael and Mia are studying the ecosystem of a local field. Which of the following conditions is most likely to lead to an increase in a field mouse population?

• the arrival of another herbivorous mammal

• the presence of a greater number of predator snakes

• the disappearance of a bird species that prey on the mouse

• the lack of adequate rainfall for plants in the mouse’s habitat

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Match the letters and numbers in the components of the picture of the food chain below. C is

• Primary consumer

• Tertiary consumer

• Secondary consumer

• Quaternary consumer

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Abigail is studying a food chain in her biology class. She learns that a plant captures 20,000 Kcal of energy from the sun. Use the 10% rule to calculate the estimated level of energy that will be transferred to the fox, which is at the third trophic level.

• 20,000 Kcal

• 2,000 Kcal

• 200 Kcal

• 0 Kcal

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Identify the ecological role of the red-tailed hawk and the elf owl in the food web. (You must write 3-4 sentences and include information to support your answer for full credit.)

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Describe how an increase in the elf owl population size would most likely affect (decrease or increase) two other population sizes in the food web. Explain each of your answers. (You must write 3-4 sentences and include information to support your answer for full credit.)

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A decrease in the wood rat population size could lead to either a decrease or an increase in the red-tailed hawk population size. Explain how a decrease in the wood rat population size could lead to a decrease in the red-tailed hawk population size. (You must write 3-4 sentences and include information to support your answer for full credit.)

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Energy flows from producers to consumers, as shown in food chains and food webs. Only about 10% of that energy is transferred when a consumer eats. What happens to the remainder of the energy that does not get transferred?

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In a garden, Samuel observes how different living things get their energy. Which of the following statements describes one way that energy is transferred in this garden food web?

• Producers store energy made by animals.

  
  

• Energy is cycled between producers.

  
  

• Consumers obtain energy directly from sunlight.

  
  

• Plants provide energy to consumers.

  
  

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