A student performed the same experiment but used radish sprouts. their data showed three peaks for the optimal ph at 2.4, 8.5, and 10.6. propose a logical hypothesis for the observed data.

The logical hypothesis for the observed data could be something like:

The reason of the difference in optimal Ph between the experiments could be caused by the Enzyme extract of the different enzymatic forms of the Radish Sprouts, causing different level of Ph