Meredith Robbins Ms. Sobota The Environmental Effects on Mitosis Research Question: How much of an effect does the IAA have on the rate of cell division in onion roots? Null Hypothesis: The IAA will not have a significant impact on the rate of cell division. Alternative Hypothesis 1: If the IAA is added to the water/ soil then it will have a higher rate on cell division. Alternative Hypothesis 2: If the IAA is added to the water/ soil then it will have a lower rate on cell division. IV: IAA DV: The rate of Cell Division Summary: