The diagram illustrates the outlines of three xerophytic leaves of the same type under three different conditions, P, R and S. Which statement about the water potential of the cells in layer Y is correct?
- AP higher than R and S; R lower than P and S; S lower than P
- BP higher than S; R lower than P; S higher than P
- CP lower than R; R higher than S; S higher than R
- DP lower than R and S; R higher than P; S lower than P