Fig. 3.1 is a photomicrograph showing part of a transverse section through the root of an iris, Iris germanica. Irises are herbaceous monocotyledons. These plants have the same transport tissues as herbaceous dicotyledons, but the transport tissues are distributed differently. In monocotyledons, the central tissue in the root is parenchyma (packing tissue). [Figure 3.1] Cells R, S and T in Fig. 3.1 are found in different tissues. Name the tissues in which the cells labelled R, S and T are found.

1. (a)(i)Fig. 3.1 is a photomicrograph showing part of a transverse section through the root of an iris, Iris germanica. Irises are herbaceous monocotyledons. These plants have the same transport tissues as herbaceous dicotyledons, but the transport tissues are distributed differently. In monocotyledons, the central tissue in the root is parenchyma (packing tissue). [Figure 3.1] Cells R, S and T in Fig. 3.1 are found in different tissues. Name the tissues in which the cells labelled R, S and T are found.[3]
2. (a)(ii)Outline the role of the tissue in which cell R is found in Fig. 3.1.[2]
3. (a)(iii)State an example of an organic compound that is translocated in the root of an iris.[1]
4. (b)The electron micrograph in Fig. 3.2 shows a section through some root cells in an onion, Allium cepa. [Figure 3.2] On Fig. 3.2, draw a label line and label it with the letter P to identify one plasmodesma.[1]
5. (c)Table 3.1 contains information about four polysaccharides found in animals or plants. Complete Table 3.1 by filling in the missing information. [Table 3.1][3]

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