medium · Enhanced ACT science
A researcher measures the effect of light wavelength on the rate of photosynthesis (measured by O₂ production):
| Wavelength (nm) | Color | O₂ Produced (mL/hr) |
| :--- | :--- | :--- |
| 450 | Blue | 42 |
| 550 | Green | 8 |
| 650 | Red | 38 |
What is the most likely reason for the low O₂ production at 550 nm?
- Wavelengths near 550 nm are blocked by the oxygen bubbles being produced.
- Green light has too much energy, causing the plant's chloroplasts to denature.
- The plant is using green light exclusively for cellular respiration instead.
- Chlorophyll pigments reflect green light rather than absorbing it for energy.
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