CAIE A Level Biology 9700 · Photosynthesis
An experiment was carried out to investigate the effect of light intensity on the rate of photosynthesis in an aquatic plant (Elodea). The number of oxygen bubbles produced per minute was recorded at different light intensities. The results are shown in the table.
| Light intensity (arbitrary units) | Bubbles per minute |
|---|---|
| 0 | 0 |
| 10 | 5 |
| 20 | 10 |
| 40 | 18 |
| 60 | 22 |
| 80 | 25 |
| 100 | 25 |
Describe the effect of light intensity on the rate of photosynthesis in this experiment.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
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