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A student measured the transpiration rate (arbitrary units) of two plant species, X (a typical mesophyte) and Y (a xerophyte), at different times of day under the same environmental conditions. The results are shown in the table.
| Time of day | Transpiration rate of X (arbitrary units) | Transpiration rate of Y (arbitrary units) |
|---|---|---|
| 06:00 | 2 | 1 |
| 10:00 | 8 | 3 |
| 14:00 | 12 | 5 |
| 18:00 | 6 | 4 |
| 22:00 | 1 | 2 |
Compare the transpiration rates of species X and species Y, and explain the differences in terms of the adaptations of xerophytes and the mechanisms of water transport in plants.