NYJC 2024 H2 Biology P4 (A)

9744 / H2 Biology / 04 NANYANG JUNIOR COLLEGE PRELIMINARY EXAMINATIONS Higher 2 CANDIDATE NAME ANSWERS CLASS BIOLOGY 9744/04 Paper 4 Practical 22 August 2024 Candidates answer on the Question Paper Additional Materials: As listed in the Confidential Instructions 2 hour 30 minutes READ THESE INSTRUCTIONS FIRST Write your name and CT on all the work you hand in. 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, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. 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. Shift Laboratory At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use 1 23 2 32 Total 55 This document consists of 16 printed pages and 0 blank pages. [Turn over H

2 Answer all the questions. 1 J1 is a slide of a stained transverse section through a plant leaf. (a) (i) Draw a large plan diagram of the whole section on J1. Use a sharp pencil. Use one ruled label line and label to identify the epidermis. 1 label line and label to epidermis ; 2 uses most of the available space and no shading (2/3 of space given) ; 3 whole leaf section drawn and no cells drawn ; i resin chambers drawn 4 correct shape of the leaf ; 5 4 layers; 6 draws stomata opening into an air space; [5] (ii) The leaf section on J1 is from a plant that lives at high altitudes in very cold conditions. In the winter the ground is often frozen and plants are unable to take up water. Suggest one observable feature of the leaf section on J1 which enables it to survive these conditions. Cuticle; Few/ sunken stomata; [1]

3 (iii) Observe the cells in the epidermis of the section on J1. Select a line of four adjacent cells that make up this tissue. Each cell must touch at least one of the other cells. • Make a large drawing of this line of four cells. • Use one ruled label line and label to identify the cell wall of one cell. 1. uses most of the available space and all lines sharp and continuous ; 2. draws only four whole cells and each cell touches at least one other cell 3. cell wall drawn as two lines around each cell and three lines where cells touch ; 4. correct cell shape/ proportion 5. label line and label to one cell wall ; 6. draws inclusions in at least two cells ; [5]

4 (b) Fig. 1.1 is a photomicrograph of a stained transversed section thro