Biology 9700 · AS & A Level · Structure of transport tissues
Structure of transport tissues — practice question
Fig. 3.1 presents a photomicrograph of part of a transverse section through the root of an iris, $\textit{Iris germanica}$. Irises are herbaceous monocotyledons. These plants contain the same transport tissues as herbaceous dicotyledons, but the arrangement of the transport tissues is different. In monocotyledons, the central region of the root is parenchyma (packing tissue).
(a(i))[3]
Cells R, S and T in Fig. 3.1 are located in different tissues. Name the tissues that contain cells R, S and T.
(a(ii))[2]
Outline the function of the tissue in which cell R is found in Fig. 3.1.
(a(iii))[1]
State one example of an organic compound that is translocated in the root of an iris.
(b)[1]
The electron micrograph in Fig. 3.2 shows a section through some onion root cells, Allium cepa. On Fig. 3.2, draw a label line and mark it with the letter P to identify one plasmodesma.
(c)[3]
Table 3.1 gives information on four polysaccharides found in animals or plants. Complete Table 3.1 by adding the missing details.
Worked solution & mark scheme
This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “R corresponds to endodermis” …