Original Project
Interdependence in Ecosystems
Given adequate resources and an absence of disease or predators, populations of organisms in ecosystems can incr…
Item ID081003: The size of populations of robins can increase when there is an increase in the food available and a decrease in the number of its predators.
Which of the following statements is TRUE about increases in the size of populations of robins?
- The size of populations of robins can increase to be infinitely large.
- The size of populations of robins always increases at about the same rate.
- The size of populations of robins always stays about the same because the number of deaths is always about the same as the number of new robins hatched.
- The size of populations of robins can increase when there is an increase in the food available and a decrease in the number of predators.
- Distribution of Responses
- Students Responding Correctly
| Group | Correct | Total | Percent |
|---|---|---|---|
| Overall | 1712 | 2846 | 60% |
| Grades | |||
| 6–8 | 917 | 1613 | 57% |
| 9–12 | 792 | 1228 | 64% |
| Gender | |||
| Male | 804 | 1380 | 58% |
| Female | 883 | 1425 | 62% |
| Primary Language | |||
| English | 1585 | 2610 | 61% |
| Other | 94 | 173 | 54% |
- Disciplinary Core Ideas
- LS2.A Organisms, and populations of organisms, are dependent on their environmental interactions both with other living things and with nonliving factors.
- NRC Framework
- Stability and Change: An understanding of dynamic equilibrium is crucial to understanding the major issues in any complex system--for example, population dynamics in a ecosystem...