1.1. An investigation was carried out to test the effect of temperature on the rate of photosynthesis of pondweed.

The volume of oxygen produced per hour was measured. The results can be seen in Table 1.

Table 1

Calculate the mean rate of photosynthesis per hour when the temperature was 45 °C.

1.2. Plot the results from Table 1 onto an appropriate graph using the graph paper in Fig. 1.

Fig. 1

1.3. Describe and explain the results shown in the graph.

1.4. A farmer growing strawberries in his greenhouse used the results in Table 1 to decide on the best temperature for his greenhouse. He decided to heat the greenhouse to 30 °C.

When the farmer measured the rate of photosynthesis of his plants, he found the rate to be 11.5% slower than the data suggested.

Calculate the rate of photosynthesis that the farmer actually achieved at 30 °C.

1.5. Suggest why the farmer may not have achieved a rate of photosynthesis as high as the data in Fig. 1 predicted.