Table 1 shows the rate of carbon dioxide fixation (μmol m−2 s−1\mu\text{mol m}^{-2}\text{ s}^{-1}μmol m−2 s−1) in different cell layers of a sclerophyllous leaf when exposed to a light intensity of 800 μmol m−2 s−1800\ \mu\text{mol m}^{-2}\text{ s}^{-1}800 μmol m−2 s−1.
Table 1
| Leaf cell layer | Rate of carbon dioxide fixation (μmol m−2 s−1\mu\text{mol m}^{-2}\text{ s}^{-1}μmol m−2 s−1) |
|---|---|
| Upper epidermis | 0.2 |
| Palisade mesophyll | 22.7 |
| Spongy mesophyll | 6.3 |
| Lower epidermis | 0.9 |
Describe the difference in the rate of carbon dioxide fixation in the palisade mesophyll and the spongy mesophyll layer shown in Table 1.
