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

1. (a)(i)Draw a large plan diagram of the region of the stem on K1 indicated by the shaded region in [Figure 2.1]. Use a sharp pencil. Use one ruled label line and label to identify the epidermis.[5]
2. (a)(ii)Observe one of the larger vascular bundles of the section 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 wall of one xylem vessel element.[5]
3. (b)[Figure 2.2] shows a diagram of a stage micrometer scale that is being used to calibrate an eyepiece graticule. The length of one division on this stage micrometer is 1mm.
4. (b)(i)Use Fig. 2.2 to calculate the actual length of one eyepiece graticule unit. Show your working. actual length = .................................................................[3]
5. (b)(ii)Use the calibration of the eyepiece graticule from (b)(i) to calculate the actual diameter of the section in [Figure 2.3]. Show your working. actual diameter = .................................................................[2]
6. (b)(iii)Identify three observable differences, other than size and colour, between the stem section on K1 and the stem section on Fig. 2.3. Record three observable differences in Table 2.1. Table 2.1 feature K1 Fig. 2.3.[3]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.