KCPSS_2024_4E_SciBio_Prelim_P4

1 KCPSS 2024/Sec 4Exp/SBB Prelim Sci (Bio) P4 [Turn Over KUO CHUAN PRESBYTERIAN SECONDARY SCHOOL 2024 PRELIMINARY EXAMINATION Secondary 4 Express / 4 Normal Academic (SBB) NAME CLASS REG. NO SCIENCE (CHEMISTRY/BIOLOGY) 5088 / 04 Paper 4 Biology Paper 4: 1 hour 15 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your class, index number and name on all the work you hand in. Write in dark blue or black pen on both sides of the paper. You may use an HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. 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. Section A Answer all questions. Write your answers in the spaces provided on the question paper. Section B Answer one question. Write your answers in the spaces provided on the question paper. The number of marks is given in brackets [ ] at the end of each question or part question. FOR EXAMINER’S USE Section A Section B Total This document consists of 21 printed pages, including the cover page. ………….……...…….....…... Parent’s signature/ Date

2 KCPSS 2024/Sec 4Exp/SBB Prelim Sci (Bio) P4 [Turn Over Section A Answer all questions. Write your answer in the spaces provided. 1 Fig. 1.1 represents an enzyme and substrate involved in a reaction which takes place in the mouth. Fig. 1.1 (a) Name A and B. A ………………………………………………………….….…………………….. B ………………………………………………………….….…………………….. [1] (b) In the space below, draw the enzyme-substrate complex and the final products formed during the reaction. Label your drawing. enzyme-substrate complex final product [2] substrate A enzyme B

3 KCPSS 2024/Sec 4Exp/SBB Prelim Sci (Bio) P4 [Turn Over (c) A student carried out the Benedicts’ test on a solution of substrate A and a solution consisting of the final products drawn in (b). Predict the observation for the two solutions. solution of the substrate A ………………………………………………………….…. solution of final products in (b) ………………………………………………….….… [1] [Total: 4] 2 Fig. 2.1 represents what the human alimentary canal would look like if it