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WorksheetsQuiz #3 Pre AP Energy Transfer
Total questions: 12
Worksheet time: 12mins
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
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
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
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
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
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
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
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
A student claims that removing all decomposers from an ecosystem would not affect the energy pyramid. Use your understanding of energy flow to evaluate this claim.
The claim is correct because decomposers are not part of the energy pyramid
The claim is incorrect because decomposers recycle nutrients, supporting producers and energy flow
The claim is correct because energy only flows through consumers
The claim is incorrect because decomposers are top predators
If a disease wipes out most of the primary consumers in a forest, what would be the likely effect on the producers and secondary consumers? Explain your answer.
Producers would decrease, and secondary consumers would increase
Producers would increase, and secondary consumers would decrease
Both producers and secondary consumers would increase
Both producers and secondary consumers would decrease
