(a)[2]
On Fig. 1.1, use label lines and letters to show: A - a cell in the epidermal layer. B - a cell that contains PEP carboxylase.
(b(i))[1]
Identify the cell type marked C in Fig. 1.1.
(b(ii))[4]
Explain how the leaf structure shown in Fig. 1.1 adapts the C4 plant so that a high photosynthetic rate is maintained at high temperatures.
(c(i))[4]
Using Fig. 1.2, compare the photosynthesis rates of the C3 and C4 plants in high $\text{CO}_2$ conditions.
(c(ii))[2]
Using Fig. 1.2, compare the photosynthesis rates under low and high $\text{CO}_2$ conditions in the C4 plant between $30\,^{\circ}\text{C}$ and $35\,^{\circ}\text{C}$, and suggest an explanation for the difference.