A student investigated the effect of temperature on the stomatal pore width in the leaves of a geranium plant kept in a growth chamber with constant light intensity.
| Temperature (∘C^\circ\text{C}∘C) | Average width of stomatal pore (μm\mu\text{m}μm) |
|---|---|
| 15 | 8.2 |
| 20 | 8.5 |
| 25 | 6.4 |
| 30 | 3.1 |
| 35 | 1.2 |
Using the data in the table, explain why the change in temperature from 20∘C20^\circ\text{C}20∘C to 35∘C35^\circ\text{C}35∘C affected the width of the stomatal pore.
