- Pour 150 mL of water into the 200 mL beaker to ensure the volume of water is controlled
- Pour 10 grams of baking soda (\(NaHCO3\)) into the water, mix using glass rod to ensure that the quantity of carbon dioxide is controlled
- Cut Hygrophilla difformis into 5cm * 5cm pieces (15 pieces total), using a ruler to measure to ensure that the size of the surface area of the plant is kept at a constant
- Set up the Vernier light intensity probe in the same manner as the diagram shown above (Vernier probe replacing the lamp)
- Connect Vernier light intensity device to a laptop, the software should display a light intensity of 10 lux
- Place the 5cm * 5cm Hygrophilla difformis into the beaker
- Place the beaker into the water bath (25 degrees Celcius) and leave for five minutes to acclimatize to light intensity
- Count bubbles in one minute after the five minutes elapsed
- Move the Vernier light intensity probe towards the beaker until 25 lux is displayed on the laptop, repeat steps 1-7, the same should be done for 40 lux, 55 lux, and 70 lux
- 5 Trials should be carried out at each light intensity
Results
RAW DATA