A student investigated the effect of light intensity on the rate of photosynthesis in Cabomba pondweed.
They varied the light intensity by placing an LED light source at different distances from the pondweed and measured the volume of oxygen gas collected over a 10-minute period.
| Distance of light source (cm) | Volume of oxygen gas collected in 10 minutes (cm3\text{cm}^3cm3) | |||
|---|---|---|---|---|
| Test 1 | Test 2 | Test 3 | Mean | |
| 15 | 6.3 | 6.1 | 6.2 | 6.2 |
| 30 | 3.2 | 3.0 | 3.1 | 3.1 |
| 45 | 1.6 | 1.5 | 1.4 | 1.5 |
| 60 | 0.9 | 0.7 | 0.8 | 0.8 |
Give a conclusion about the effect of the distance of the light source on the rate of photosynthesis based on the results in Table 1.
