TJC 2023 H2 BIO P2 QP

1 [TURN OVER READ THESE INSTRUCTIONS FIRST Write your Center number, index number and name in the spaces at the top of this page. 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. 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 any working or if you do not use appropriate units. TEMASEK JUNIOR COLLEGE 2023 JC2 PRELIMINARY EXAMINATION Higher 2 CANDIDATE NAME CENTRE NUMBER S INDEX NUMBER BIOLOGY 9744/02 Paper 2 Structured Questions (Part I) 25 AUGUST 2023 2 hours Candidates answer on the Question Paper. No Additional Materials are required. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use 1 / 12 2 / 11 3 / 11 4 / 10 5 / 8 Answer all questions. This document consists of 16 printed pages.

2 Answer all questions. 1 Fig. 1.1 shows an electron micrograph of a plant cell. Fig. 1.1 (a) Identify the organelles labelled A, B, and C in Fig. 1.1. A: ………………………………………………………………….. B: ………………………………………………………………….. C: ………………………………………………………………….. [3] (b) Use a line to label the cell wall, D. [1] (c) The magnification of the photomicrograph is 560x. Calculate the actual length of organelle C in μm, along the line P-Q. Show your working. actual length of organelle C: ………………………………. μm [2]

3 [TURN OVER (d) Compare the structural features of organelle A and organelle B. …………………………………………………………………………………………………………………. …………………………………………………………………………………………………………………. …………………………………………………………………………………………………………………. …………………………………………………………………………………………………………………. ……………………………………………………………………………………………………………… [2]

4 (e) A factor that can limit the rate of photosynthesis is the rate of regeneration of RuBP. Sedoheptulose-1,7-bisphosphatase (SBPase) is an enzyme in the Calvin cycle that controls the rate of regeneration of RuBP. SBPase is coded for by the gene SBPase , which is present in most plants. In an experiment, 2 wheat plants were studied. • one was genetically modified to make more SBPase by introducing the SBPase gene from another grass species. • one was not modified (wild type). Fig. 1.2 shows the mean mass of plant for the wild type plants and genetically modified plants. Fig. 1.2 Suggest and explain why genetically modified plants have a different mean mass than wild type plants. ……………………………………………………………………………………………………………. ….………………………………………………………………………………………………………… …….……………………………………………………………………………………………………… …….………………………………………………