(a)[3]
State the term that corresponds to each of the descriptions A, B and C. A The root epidermal cell specialised for providing a large surface area for water uptake from the soil. B The strip of suberin in the endodermal cell walls that stops water moving through the apoplastic pathway. C The cell structures that let water pass from one cell to the next as part of the symplastic pathway.
(b)[2]
Explain, with reference to the structure of xylem vessel elements, why water does not follow a symplastic route in the xylem to the leaves.
(c)[3]
Explain why the rate at which water moves in the xylem may decrease at night.