(a)[3]
Explain why transport systems are needed in plants.
(b)
Fig. 3.1 shows a transverse section of part of the stem of a dicotyledonous plant. Cell A and cell B take part in the transport of dissolved organic molecules.
(b(i))[1]
Name cell A and cell B.
(b(ii))[5]
With reference to Fig. 3.1, explain how the different structures of cell types A and B are related to their function.
(c)[4]
Complete Table 3.1 by stating four differences between transport systems in mammals and in plants.