Item IE014004: Changes in a population in a food web (robins) can affect the population of its prey (caterpillars).

The diagram below shows the feeding relationships between populations of plants and animals in an area. The arrows point from the organisms being eaten to the organisms that eat them. 


A disease kills all of the robins in this area. It does not kill any other plants or animals. If the size of the fox population stays the same, which population of organisms will increase after the robins die? Use only the relationships between the plants and animals shown in the diagram.

A. Mice

B. Owls

C. Trees

D. Caterpillars

Distribution of Responses

Chart showing distrubtion of responses for Item IE014004

Percent of students responding correctly

Grades 6–866%
Grades 9–1274%
Primary Language is English70%
Primary Language is not English59%

View data table