(a(i))[3]
State the letter in Fig. 1.1 which shows where: gas exchange is controlled most photosynthesis occurs spongy mesophyll cells are located.
(a(ii))[1]
Draw a circle on Fig. 1.1 so that a vascular bundle is identified.
(a(iii))[2]
State the names of two substances that are moved only by translocation. 1 2
(b)[3]
Explain how xylem vessels are adapted for their functions.
(c)[4]
Describe how water moves from the soil to the air spaces in a leaf through a plant.
(d)[2]
Explain why plants need nitrate ions.