DHS Practical Skills revision worksheet

1 DUNMAN HIGH SCHOOL H2 BIOLOGY Practical Skill Revision Worksheet 3 Suggested Answers 1 Fig 1.1 shows a microscopic image of a stained cross section through a stem of a terrestrial plant. Fig 1.1 You are not expected to be familiar with this specimen. Observe the different tissues in the region of Fig. 1.1 shown by the shaded area in Fig. 1.2 below.

2 Fig. 1.2 Use the space provided to draw a large plan diagram of the part of the stem shown by the shaded area in Fig 1.2. A plan diagram shows the arrangement of different tissues, including their correct shapes and proportions. No cells should be drawn. Labels are not required. [5] 1. Large drawing; 2. smooth and continuous lines; 3. accurate drawing of the different tissue layers (minimally the 3 lines indicated with ); 4. 3 layers in the vascular bundle; 5. accurate proportions of the layers;

3 2 Fig 2 shows a microscopic image of a stained cross section through a root of a terrestrial plant. Fig 2 You are not expected to be familiar with this specimen. Observe the different tissues in Fig 2 and use the space provided to draw a large plan diagram of Fig 2. A plan diagram shows the arrangement of different tissues, including their correct shapes and proportions. No cells should be drawn. Labels are not required. [5] 1. Large drawing; 2. smooth and continuous lines; 3. accurate drawing of the different tissue layers; 4. large air spaces in the middle; 5. accurate proportions of the layers;

4 3 Fig 3 shows the cross section of two apples, one before (Fig 3A) and one after (Fig 3B) iodine staining. Fig. 3 You are not expected to be familiar with these specimens. Observe the different tissues in Fig 3 and use the space provided to draw a large plan diagram of a cross section of an apple. A plan diagram shows the arrangement of different tissues, including their correct shapes and proportions. Label the region stained by iodine. [5] 1. Large drawing; 2. smooth and continuous lines; 3. accurate drawing of the different tissue layers; 4. accurate proportions of the layers; 5. label iodine-stained region;

5 4 Fig 4.1 and 4.2 shows microscopic image of a stained transverse section through a leaf of a terrestrial plant. You are not expected to be familiar with this specimen. Fig 4.1 Fig 4.2

6 (a) Observe the different tissues in the region boxed out in Fig. 4.1. Use the space provided to draw a large plan diagram of the part of the leaf boxed out in Fig. 4.1. A plan diagram shows the arrangement of different tissues, including their correct shapes and proportions. No cells should be drawn. Labels are not required. [5] (b) Observe the cells in the layer labelled in Fig. 4.2. Make a large drawing of 3 cells in this layer labelled in Fig.4.2. Labels are not required. [4] 1. Large drawing; 2. smooth and