(a)[4]
Describe how stomata open when light is present.
(b(i))[2]
Using Fig. 3.1, describe the link between the concentration of ABA in the xylem sap and stomatal conductance.
(b(ii))[4]
Suggest reasons for the results displayed in Fig. 3.1.
(c)[1]
State where transcription factors bind in order to increase the rate of transcription.