A student investigated how light intensity and temperature affect the rate of photosynthesis in a suspension of the unicellular green alga Chlorella vulgaris. The rate of photosynthesis was determined by measuring the increase in dissolved oxygen concentration using an oxygen probe over a 10-minute period.
The student's results are shown in the table below:
| Light intensity (arbitrary units) | Temperature (∘C^\circ\text{C}∘C) | Increase in dissolved oxygen concentration (mg L−1\text{mg L}^{-1}mg L−1) |
|---|---|---|
| 20 | 10.0 | 0.8 |
| 80 | 10.0 | 2.4 |
| 150 | 10.0 | 3.6 |
| 300 | 10.0 | 3.9 |
| 20 | 25.0 | 1.8 |
| 80 | 25.0 | 5.4 |
| 150 | 25.0 | 1.2 |
| 300 | 25.0 | 9.2 |
| 20 | 45.0 | 0.1 |
| 80 | 45.0 | 0.2 |
| 150 | 45.0 | 0.2 |
| 300 | 45.0 | 0.3 |
Identify the anomalous result in the table and describe how the student could confirm whether this result is indeed an anomaly.
Suggest why the rate of photosynthesis is extremely low at all light intensities when the temperature is 45.0∘C45.0^\circ\text{C}45.0∘C.
