Table 1 shows the rate of carbon dioxide absorbed per hour (in arbitrary units) by different layers of a deciduous leaf when exposed to light.
Table 1
| Leaf layer | Rate of carbon dioxide absorbed per hour (arbitrary units) |
|---|---|
| Upper epidermis | 0 |
| Palisade mesophyll | 35 |
| Spongy mesophyll | 12 |
| Lower epidermis | 2 |
Describe the difference in the rate of carbon dioxide absorbed per hour in the palisade mesophyll and the spongy mesophyll layer shown in Table 1.
