Fig. 5.1 shows how temperature affects the transpiration rate from the upper and lower leaf surfaces when the leaf is supplied with water at a constant rate.
(a)[3]
Describe the pattern shown in Fig. 5.1.
(b)[4]
Explain the reasons for the shape of the graph for the upper surface of the leaf at X and at Y in Fig. 5.1.
(c)[1]
Suggest how the lower surface differs structurally from the upper surface of the leaf used in this investigation.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “the rate rises then stays constant as temperature increases” …