Step 1 - Place the pondweed in a beaker., Step 2 - Place the lamp on the 0cm mark on the ruler., Step 3 - Place the water beaker on the 10cm mark on the ruler., Step 4 - Turn the lamp on and leave for 5 minutes to acclimatise (get used to the light)., Step 5 - Start the stopwtach and count how many bubbles are made in a minute., Step 6 - Repeat the experiment at 10cm intervals.,

junior cert science Photosynthesis Experiment

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