Scientific calculations - effect of light intensity on photosynthesis
The table shows a set of results obtained by students investigating the effect of light intensity on photosynthesis. They varied the distance of the plant from the light source.
| Distance from light source (cm) | Rate of photosynthesis (bubble per min) |
| 10 | 120 |
| 15 | 54 |
| 20 | 30 |
| 25 | 17 |
| 30 | 13 |
| Distance from light source (cm) | 10 |
|---|---|
| Rate of photosynthesis (bubble per min) | 120 |
| Distance from light source (cm) | 15 |
|---|---|
| Rate of photosynthesis (bubble per min) | 54 |
| Distance from light source (cm) | 20 |
|---|---|
| Rate of photosynthesis (bubble per min) | 30 |
| Distance from light source (cm) | 25 |
|---|---|
| Rate of photosynthesis (bubble per min) | 17 |
| Distance from light source (cm) | 30 |
|---|---|
| Rate of photosynthesis (bubble per min) | 13 |
If we draw a graph of this data:
Note that this graph is a curve.
Question
From the graph, suggest the rate of oxygen production when the light source is at 18 cm.
40 bubbles per minute.
Using the graph:
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