Science 7.12A SLA Questions

What is the primary source of energy for nearly all ecosystems?

• The Moon

• The Sun

• Chemical reactions

• Decomposers

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

• 90%

• 50%

• 10%

• 25%

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Which organisms are classified as producers in an ecosystem?

• Bacteria and fungi

• Lions and tigers

• Rabbits and deer

• Plants and algae

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What is the primary role of decomposers in an ecosystem?

• To produce their own food

• To eat other predators

• To break down dead organisms

• To consume plants only

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Which of these is an example of a primary consumer?

• Eagle

• Grasshopper

• Snake

• Lion

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What are organisms called that can make their own food?

• Heterotrophs

• Carnivores

• Herbivores

• Autotrophs

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

• Secondary consumers

• Tertiary consumers

• Primary consumers

• Producers

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If a disease killed many plants in an ecosystem, how would this most likely affect the food web?

• Only decomposers would be affected

• It would increase herbivore populations

• Predator populations would decrease

• Energy flow would increase

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Why do ecosystems typically have fewer tertiary consumers than primary consumers?

• Tertiary consumers reproduce more slowly

• Energy decreases at each trophic level

• Primary consumers eat more food

• Tertiary consumers are smaller

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How might deforestation of a large area affect the energy flow in an ecosystem? Analyze the potential cascade of effects.

• Only plant species would be affected

• The ecosystem would quickly recover

• Energy flow would be disrupted at all levels

• Predator populations would increase

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