(a)[2]
Explain why a leaf is regarded as an organ.
(b)[6]
Explain how layer B and layer C in Fig. 1.1 are adapted to carry out their functions.
(c(i))[1]
Identify the cell labelled D on Fig. 1.2.
(c(ii))[1]
State the main function of the stomata.
(c(iii))[1]
State the advantage to the plant of the stomatal change shown in Fig. 1.2.
(d)[3]
Predict and explain the effect of high humidity on the stomata.