O-LevelBiologyTransport in Plants5090/21 · May/June 2016 · Q17 Marks
Fig. 1.1 shows a plant with a magnified transverse section (TS) of the root and an incomplete, magnified transverse section (TS) of the stem. [Figure 1.1]
- (a)The transverse section of the root in Fig. 1.1 shows the distribution of xylem and phloem tissue.
- (a)(i)Using a labelling line and the letter X, show, on Fig. 1.1, the location of the xylem tissue in the transverse section (TS) of the root.[1]
- (a)(ii)Complete the transverse section (TS) of the stem in Fig. 1.1 to show the distribution of xylem and phloem tissue.[2]
- (a)(iii)Using a label line and the letter P, show the location of the phloem tissue that you have drawn.[1]
- (b)State the functions of phloem tissue.[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.
Mark scheme
Marking points from the official mark scheme (May/June 2016). The mark or mark type is shown in brackets.
- [1] Label line X on xylem on transverse section of root ;
- [max 2] vascular bundle drawn towards outside of transverse section of stem;
- vascular bundle divided into two sections;
- three or more vascular bundles drawn ;
- [1] label line P drawn in correct location (outer side of vascular bundle);
- [max 3] translocation ;
- transport;
- dissolved/in solution ;
- sugar(s)/sucrose/products of photosynthesis ;
- amino acids ;
- reference from source + to sink/leaves to roots AW;
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