Required Practical Flashcards
Name a method for measuring effect of light intensity on photosynthesis.
1) Set up a boiling tube containing 45cm³ of sodium hydrogen carbonate solution (1%). Allow the tube to stand for a few minutes and shake to disperse any air bubbles that might form.
2) Cut a piece of the pondweed. It should be 8cm long.
3) Uce forceps to place the pondweed in the boiling tube carefully.
4) Position the boiling tube so that the pondweed is 10cm away from the light source. Allow the boiling tube to stand for 5 minutes. Count the number of bubbles emerging from the cut end of the stems in 1 minute. Repeat the count 5 times and record your results.
5) Calculate the average number of bubbles produced per minute. Repeat the experiment at different distances away from the light source.
