Quiz #3 Pre AP Energy Transfer

What is the primary reason that only about 10% of the energy is transferred from one trophic level to the next in an energy pyramid?

• Energy is created at each level

• Most energy is lost as heat or used for life processes

• Energy is destroyed at each level

• All energy is stored in the top predators

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In a food chain consisting of grass, grasshopper, frog, and snake, which organism represents the secondary consumer?

• Grass

• Grasshopper

• Frog

• Snake

Which statement correctly compares a food web to a food chain?

• A food web shows only one path of energy flow, while a food chain shows many

• A food web shows multiple interconnected food chains, while a food chain shows a single path

• A food web does not include producers, while a food chain does

• A food chain includes decomposers, while a food web does not

If the biomass at the producer level of a biomass pyramid is 1000 kg, what would be the expected biomass at the primary consumer level, assuming the ten percent rule applies?

• 100 kg

• 10 kg

• 900 kg

• 1000 kg

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Which of the following best explains why top predators are fewer in number compared to organisms at lower trophic levels?

• They reproduce more quickly

• Less energy is available at higher trophic levels

• They have more food sources

• They are smaller in size

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A student observes that the biomass of herbivores in a grassland is much less than the biomass of the plants. Using the concept of the biomass pyramid, explain why this is expected.

• Herbivores eat more than they need

• Energy is lost at each trophic level, so less biomass is supported at higher levels

• Plants grow slower than herbivores

• Herbivores are always larger than plants

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Given a food web with the following organisms: grass, rabbit, fox, and eagle, which organism would be most affected if the rabbit population drastically decreased?

• Grass, because it would have fewer consumers

• Fox, because it relies on rabbits for food

• Eagle, because it only eats grass

• Grass, because it would have more predators

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A lake ecosystem has phytoplankton, zooplankton, small fish, and large fish. If pollution kills most of the phytoplankton, predict and explain the impact on the rest of the food web.

• Zooplankton populations would increase

• Small fish populations would increase

• All higher trophic levels would decrease due to loss of the primary producer

• Large fish would become producers

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If a grassland ecosystem receives 10,000 kcal of energy from the sun, estimate the amount of energy available to secondary consumers, using the ten percent rule.

• 10,000 kcal

• 1,000 kcal

• 100 kcal

• 10 kcal

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A food web is disrupted when a new predator is introduced. Predict how this could affect the populations of both prey and other predators in the web, and explain your reasoning.

• Prey populations would increase, and other predators would have more food

• Prey populations would decrease, and other predators might face more competition

• Prey populations would not change, and other predators would benefit

• All populations would remain stable

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