1.1. Identify two limiting factors of photosynthesis.

1.2. A student wanted to test the effect of light intensity on the number of bubbles produced by an aquatic plant over one hour.

Figure 3 shows how the student set up his investigation.

Figure 3

Identify the gas being collected in the measuring cylinder which shows that the aquatic plant is photosynthesising.

1.3. The student sets up the same experiment as shown in part (b) but this time, puts some ice cubes into the beaker also.

Describe what effect this may have on the rate of photosynthesis of the plant.

1.4. Water is usually not considered a limiting factor of photosynthesis.

Which statement explains why?