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Bot GPT 3.5 A "control" leaf was not used in the photosynthesis experiment because the purpose of the experiment was to investigate the effect of different light intensities on the rate of photosynthesis. The control group is used in experiments to provide a baseline comparison for the other experimental groups. In this case, the control group would be the group that is exposed to the standard or normal conditions, which in this experiment would involve a typical light intensity.
Since the aim of the experiment was to compare the effect of varying light intensities, the control group with standard light intensity was not necessary for this specific investigation. Each test group would be compared to each other to determine the impact of different light intensities on the rate of photosynthesis.