(a(i))[3]
Fig. 3.1 shows a wheat grain. The numbered arrows show the order of events after water is absorbed by the wheat grain. Identify structures A, B and C in Fig. 3.1.
(a(ii))[6]
Using the three numbered arrows in Fig. 3.1 as a guide, outline the sequence of events that occurs after the wheat grain takes up water.
(b(i))[2]
With Fig. 3.2 as the reference, calculate the overall rate at which mean cell length increases over the period shown.
(b(ii))[2]
After auxin was applied, the pH of the cell walls fell. Outline the events responsible for this decrease in pH.
(b(iii))[3]
Explain why the cells lengthen after the pH of the cell walls falls.