medium · Enhanced ACT science
A biologist measured the rate of photosynthesis (bubbles of oxygen per minute) from a water plant at increasing light intensities, with carbon dioxide and temperature held constant:
| Light intensity (units) | Bubbles/min |
| :--- | :--- |
| 1 | 8 |
| 2 | 16 |
| 3 | 24 |
| 4 | 30 |
| 5 | 31 |
| 6 | 31 |
Which statement best describes the relationship shown by the data?
- The rate increases steadily without ever leveling off
- The rate increases at first, then levels off at higher light intensities
- The rate decreases as light intensity increases
- The rate stays constant across all light intensities
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