We definitely know that the water potential of the solution is higher (less negative) because the plant cells were more turgid. Also, since the water potential of the solution is higher than that of the plant cells, water entered the plant cells by osmosis and increased the water potential over there (it made the water potential of cells less negative as well)For the plant material placed in solutions of different concentrations, shouldn't the water potential of the cells be higher, and that of the external solution be lower in the concentrated solution and vice-versa for the dilute solution? :/