2025 DHS H2 Biology Prelims Paper 4_QP

© DHS 2025 9744/04 [Turn over Name: Centre/Index Number: Class: DUNMAN HIGH SCHOOL Preliminary Examination Year 6 H2 BIOLOGY Paper 4 Practical Candidates answer on the Question Paper. 9744/04 2 September 2025 2 hours 30 minutes READ THESE INSTRUCTIONS FIRST Write your centre number, index number, name and class at the top of this page. Give details of the practical shift and laboratory, where appropriate, in the boxes provided. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graphs. Do not use staples, paper clips, glue or correction fluid. Answer all questions in the spaces provided on the question paper. The use of an approved scientific calculator is expected, where appropriate. You may lose marks if you do not show your working or if you do not use appropriate units. The number of marks is given in brackets [ ] at the end of each question or part question. Shift Laboratory For Examiner’s Use 1 20 2 23 3 12 Total 55 This document consists of 20 printed pages.

2 © DHS 2025 9744/04 1 During this question you will require access to a microscope and slide Y. Slide Y is a slide of a transverse section of a leaf from a yew tree. You are not expected to be familiar with this specimen. (a) Draw a large plan diagram of the whole transverse section of the leaf on slide Y. A plan diagram shows the arrangement of different tissues. Your drawing should show the correct shapes and proportions of the different tissues. No cells should be drawn. Labels are not required. [4]

3 © DHS 2025 9744/04 [Turn over (b) Observe the outer layer of cells on the upper surface of the leaf on slide Y. This outer layer is called the upper epidermis and is one cell thick. The upper surface of the leaf can be identified using Fig. 1.1. Fig. 1.1 Select a group of four cells comprising two cells from the upper epidermis and two cells from the layer below the upper epidermis. Each cell must touch at least two other cells in the group. Make a large drawing of this group of four cells. [5]

4 © DHS 2025 9744/04 (c) Fig. 1.2 is a photomicrograph of a stained transverse section of a different leaf. Fig. 1.2 (i) Identify two observable differences, other than colour, between the leaf section in Fig. 1.2 and the leaf section on slide Y. Record these differences in Table 1.1. Table 1.1 Feature Fig. 1.2 Y [2]

5 © DHS 2025 9744/04 [Turn over (ii) The leaf section shown in Fig. 1.2 is from a xerophytic plant which grows in sand dunes where there is very little water. State two observable features of the leaf section shown in Fig. 1.2 which help the plant to survive in dry conditions. Explain how each