2025 ASRJC H2Bio PE P2 QP

H2 ANDERSON SERANGOON JUNIOR COLLEGE HIGHER 2 2025 JC2 PRELIMINARY EXAMINATIONS CANDIDATE NAME CLASS 2 5 / INDEX NUMBER BIOLOGY 9744/02 Paper 2 Structured Questions Candidates answer on the Question Paper. No Additional Materials are required. 22 August 2025 Friday 2 Hours READ THESE INSTRUCTIONS FIRST Write your name and class on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams or graph. Do not use paper clips, highlighters, glue or correction fluid. Answer all questions. 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. This document consists of 31 printed pages and 1 blank page. For Examiner’s Use 1 / 9 2 / 9 3 / 11 4 / 10 5 / 10 6 / 9 7 / 10 8 / 10 9 / 10 10 / 7 11 / 5 Total /100

2 ASRJC BIOLOGY DEPT 9744/2025/J2PRELIM/P2 Answer all the questions. 1 Stem cells are found throughout the human body. Lgr5 + stem cells are found in the lining of the small intestine. Fig. 1.1 shows stages in the development of one of the daughter cells produced by the mitotic division of an Lgr5+ stem cell. Fig. 1.1 (a) Explain why Lgr5+ stem cells are required in the lining of the small intestine. …………………………………………………………………………………………...……........... …………………………………………………………………………………………………........... …………………………………………………………………………………………...……........... …………………………………………………………………………………………………........... …………………………………………………………………………………………...……........... ………………………………………………………………………………………………….......[3]

3 ASRJC BIOLOGY DEPT 9744/2025/J2PRELIM/P2 [Turn over (b) Fig. 1.2 shows a goblet cell, one of the specialised cells that develops from Lgr5+ stem cells in the small intestine. Fig. 1.2 Identify the structures labelled A and B, as shown in Fig. 1.2. For each structure, state its function and one identifying feature that can be seen in Fig. 1.2. structure A …………………………………………………………………..………………............ function ………………………………..……………………………………………………………... ………………………………………………………………………………………………………… identifying feature ................................................................................................................... ………………………………………………………………………………………………………… structure B …………………………………………………………………..………………............ function ……………