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

1. (a)(i)Draw a large plan diagram of the region of the root on K1 indicated by the shaded region in Fig. 2.1. Use a sharp pencil. Use one ruled label line and label to identify the endodermis.[5]
2. (a)(ii)Observe the xylem vessel elements in the root on K1. Select a group of four adjacent xylem vessel elements. Each xylem vessel element must touch at least two other xylem vessel elements. • Make a large drawing of this group of four xylem vessel elements. • Use one ruled label line and label to identify the cell wall of one xylem vessel element.[5]
3. (b)(i)Fig. 2.2 shows a photomicrograph of a transverse section through a different root. [Figure 2.2] Identify three observable differences, other than colour, between the root section on K1 and the root section in Fig. 2.2. Record these observable differences in Table 2.1. Table 2.1 | feature | K1 | Fig. 2.2 | |---|---|---| | 1 | | | | 2 | | | | 3 | | |[3]
4. (b)(ii)Line A–B represents the diameter of the root in Fig. 2.2. Use the scale bar on Fig. 2.2 to calculate the actual diameter of the root. Show your working. Include the unit in your answer. actual diameter = ........................................................[3]
5. (b)(iii)Use your value from (b)(ii) to calculate the magnification of Fig. 2.2. Give your answer to two significant figures. magnification = × ........................................................[1]

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