A scientist investigated the effect of environmental moisture levels on the stomatal density of leaf surfaces. The plants were grown under three different moisture conditions. The results are shown in the table below.
| Moisture level during growth | Number of stomata per mm2\text{mm}^2mm2 |
|---|---|
| Arid (dry) conditions | 110, 115, 120, 130, 135 |
| Moderate conditions | 210, 225, 230, 240, 245 |
| Humid (wet) conditions | 290, 310, 320, 340, 350 |
Explain the difference in the number of stomata per mm2\text{mm}^2mm2 on the leaves of plants grown in arid (dry) conditions compared to those grown in humid (wet) conditions.
