1.1. The apparatus shown in Fig. 1 was used to investigate the effects of different conditions on the rate of photosynthesis in an aquatic plant.

Fig. 1

A student investigated the effects of light and carbon dioxide on the rate of photosynthesis.

The number of bubbles of oxygen produced in one minute was counted in four different conditions.

Table 1 shows the results.

Table 1

State two conclusions about the conditions needed for photosynthesis using the information in Table 1.

1.2. The investigation was carried out at 15 °C. It was repeated at 25 °C.

Suggest and explain the effect this had on the results of test 2 and test 3.

1.3. Carbon dioxide enters plant cells by diffusion.

The word diffusion on the left can be joined to two boxes on the right to make two correct statements about diffusion. 

Draw two straight lines from diffusion to the boxes to complete the two statements.  

1.4. Table 2 shows the volume of water absorbed, as well as the water usage by a plant over a period of 24 hours.

Table 2

Calculate the percentage of water used during photosynthesis.
Show your working and give your answer to two decimal places.