Cambridge Secondary (7-9). Stage 9. MCE Science. Workbook - Unit 1: Photosynthesis and Transport in Plants - Question 19

Investigate how light intensity, varied by the distance of a freshwater plant from a light source, affects the rate of photosynthesis. Materials: freshwater plant (such as elodea, cabomba or hydrilla), beaker, test tube, water, ruler, light source such as a lamp, timer or stopwatch. Plot a graph to show your results.
• Label the horizontal and vertical axes, including any units.
• Plot the points on the graph.
• Draw a line to connect the points.