Food Web Model Assessment

Question 1

In a food web, which organisms are responsible for capturing energy from the sun and converting it into food through photosynthesis?

Accepted Answer

Producers

Question 2

A student draws a food web and includes arrows between organisms. What does each arrow in a food web correctly represent?

Accepted Answer

The direction energy flows from prey to predator

Question 3

A forest food web includes grass → rabbits → foxes → decomposers. If a disease kills most of the foxes, what is the most likely immediate effect on the rabbit population?

Accepted Answer

The rabbit population will increase because their predator is gone

Question 4

Which of the following best explains why decomposers are included in a complete food web model?

Accepted Answer

They break down dead matter and return nutrients to the soil, cycling matter back into the system

Question 5

A student's food web model shows that a hawk eats snakes, rabbits, and mice. What does this tell us about the hawk's role in the ecosystem?

Accepted Answer

The hawk is a consumer that helps control multiple prey populations

Question 6

In a food web, energy is transferred from one trophic level to the next. What happens to most of the energy at each level?

Accepted Answer

It is lost as heat and used for life processes, so only about 10% moves to the next level

Question 7

Which statement correctly describes the difference between how matter and energy move through a food web?

Accepted Answer

Matter cycles repeatedly through the ecosystem, while energy flows in one direction and is not recycled

Question 8

A scientist studying a grassland ecosystem notices that a drought has killed most of the grass. Using a food web model, which prediction is best supported by evidence?

Accepted Answer

The loss of grass will cascade through the food web, affecting consumers and decomposers at multiple levels

Question 9

Humans apply large amounts of fertilizer to farm fields. Some fertilizer washes into a nearby lake, causing massive algae growth that blocks sunlight and kills underwater plants. Which crosscutting concept best describes this situation?

Accepted Answer

Cause and Effect — because the human action of adding fertilizer caused changes throughout the lake ecosystem

Question 10

Two student groups propose solutions to restore a degraded forest ecosystem where decomposer populations have collapsed. Group A proposes reintroducing native fungal decomposers. Group B proposes planting more trees. Which argument is best supported by food web reasoning?

Accepted Answer

Group A, because restoring decomposers will restart nutrient cycling, which supports producers and all other organisms

Food Web Model Assessment

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