K1 is a slide of a stained transverse section through a plant leaf.

1. (a)(i)Draw a large plan diagram of the region of the leaf on K1 indicated by the shaded area in [Figure 2.1]. Use a sharp pencil. Use one ruled label line and label to identify a vascular bundle. draw this region [Figure 2.1][5]
2. (a)(ii)Observe the trichomes on the leaf on K1. Select a group of four adjacent cells that includes three epidermal cells and one trichome. Each cell must touch at least one other cell. • Make a large drawing of this group of four cells. • Use one ruled label line and label to identify the cell wall of the trichome.[5]
3. (a)(iii)The presence of trichomes on K1 suggests the leaf is from a plant that is a xerophyte. State one other observable feature that suggests the leaf is from a plant that is a xerophyte.[1]
4. (b)(i)Fig. 2.2 is a scanning electron micrograph of an open stoma. [Figure 2.2] Line P–Q represents the width of the paired guard cells that form the stoma. Line R–S represents the width of the stoma. Calculate the width of the stoma as a percentage of the width of line P–Q. Show your working and give your answer to two significant figures. answer = ..................................................... %[4]
5. (b)(ii)Fig. 2.3 and Fig. 2.4 are photomicrographs of the leaf surface from different plants. [Figure 2.3] [Figure 2.4] Identify three observable features that are different between the leaf surface in Fig. 2.3 and the leaf surface in Fig. 2.4. Record these three observable features in Table 2.1. Table 2.1 feature | Fig. 2.3 | Fig. 2.4 --- | --- | ---[4]

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