The cut end of one cutting from each plant was dead into the hormone and then planted in wet sand. The other cutting from each plant was planted and wet sand without dipping it into the hormone. All cuttings were maintained in identical environmental conditions. at the end of four weeks, all the cutting were removed from the sand in the lines of the roots that had developed for measured. The results are summarized in the data table below. What purpose did the untreated cuttings serve in this experiment

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