The diagram depicts three xerophytic leaves of the same kind in three separate conditions, P, R and S. Layer X is labelled. Which statement about the water potential of the cells in layer X is correct?
- AP: less negative than R and S; R: more negative than P and S; S: more negative than P
- BP: less negative than S; R: more negative than P; S: less negative than P
- CP: more negative than R; R: less negative than S; S: less negative than R
- DP: more negative than R and S; R: less negative than P; S: more negative than P