Original Project
Interdependence in Ecosystems
Given adequate resources and an absence of disease or predators, populations of organisms in ecosystems can incr…
Item IE081003: 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.
Answer Choice |
Overall |
Grades |
Gender |
Primary Language |
||||
|---|---|---|---|---|---|---|---|---|
| n = 2846 |
6–8 n = 1613 |
9–12 n = 1228 |
Male n = 1380 |
Female n = 1425 |
English n = 2610 |
Other n = 173 |
||
| A. | The size of populations of robins can increase to be infinitely large. | 8% | 8% | 7% | 9% | 7% | 7% | 13% |
| B. | The size of populations of robins always increases at about the same rate. | 13% | 15% | 11% | 15% | 12% | 13% | 14% |
| C. | 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. | 19% | 20% | 18% | 18% | 19% | 19% | 19% |
| D. | 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. | 60% | 57% | 64% | 58% | 62% | 61% | 54% |