Dunman 2024 6093 P2 prelims_QP

This document consists of 22 printed pages. DUNMAN SECONDARY SCHOOL CANDIDATE NAME CLASS INDEX NUMBER PRELIMINARY EXAMINATION 2024 SECONDARY 4 EXPRESS BIOLOGY 6093/02 Paper 2 27 August 2024 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class and index number on all the work you hand in. Write in dark blue or black pen. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided on the Question Paper. Section B Answer all the questions, the last question is in the form either/or. Write your answers in the spaces provided on the Question Paper. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question. Section A

2 6093/02/Prelims/4Exp/2024 Answer all questions. 1 Fig. 1.1 shows a drawing of an epithelial cell from the lining of the small intestine. Fig. 1.1 (a) Identify structure A in Fig. 1.1 and describe its function in the intestinal epithelial cell. A ………………………………………………………………………….……….………….………… function in the cell …………………………………………………………………………….………..…………………… …………………………………………………………………………….………..…………………… [2]

3 6093/02/Prelims/4Exp/2024 (b) The cholera bacterium can survive in the small and large intestine. The bacterium releases a toxin that interacts with the cell membrane. The toxin stimulates the secretion of ion X out of the intestinal cell. Fig. 1.2 shows the effect of the toxin on the epithelial cells. Fig. 1.2 (i) Secretion of ion X into the lumen of the small intestine can cause diarrhoea. Using your understanding of the movement of substances, explain how secretion of ion X causes diarrhoea. ………………………………………………………………………………………………….. ………………………………………………………………………………………………….. ………………………………………………………………………………………………….. ………………………………………………………………………………………………….. ………………………………………………………………………………………………….. ………………………………………………………………………………………………….. ………………………………………………………………………………………………….. …………….…………………………………………………………………….…..…….... [4]

4 6093/02/Prelims/4Exp/2024 (c) Cholera is an infectious disease spread through contaminated water and food. Cholera vaccines can be taken orally to reduce the risk of contracting cholera. (i) Describe how the vaccine reduces the risk of contracting cholera. ………………………………………………………………………………………………….. ………………………………………………………………………………………………….. ………………………………………………………………………………………………….. …………….…………………………………………………………………….…..…….... [2] (ii) Suggest two other ways to prevent the spread of cholera. 1 ………………………………………………………………………………………………... ………………………………………………………………………………………………….. 2 ………