YIJC 2023 H2 9744 P2 QP

1 @YIJC 9744/02/PE/2023 [Turn over YISHUN INNOVA JUNIOR COLLEGE JC2 PRELIMINARY EXAM Higher 2 NAME INDEX NO CG BIOLOGY Paper 2 Structured Questions Candidates answer on the Question Paper. No Additional Materials are required. 9744/02 30 Aug 2023 2 hours READ THESE INSTRUCTIONS FIRST Write your name, index no. and CG on this cover page. Write in dark blue or black pen on both sides of the paper. You may use a soft pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. 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. The number of marks is given in brackets [ ] at the end of each question or part question This document consists of 23 printed pages and 1 blank page. For Examiner’s Use Section A 1 10 2 10 3 8 4 10 5 10 6 12 7 10 8 10 9 10 10 5 11 5 Total 100

2 @YIJC 9744/02/PE/2023 Answer all questions. 1 Fig. 1.1 shows an electron micrograph of a chloroplast. Fig. 1.1 (a) (i) On Fig. 1.1, use the letter X and a label line to identify where the light - independent stage of photosynthesis occurs. [1] (ii) Describe two ways in which the structure of the chloroplast is adapted for its function. [2] (iii) Both the c hloroplast and the mitochondrion have double membranes. State two other structural similarities between the chloroplast and the mitochondrion. [2]

3 @YIJC 9744/02/PE/2023 [Turn over (b) Fig. 1.2 shows the relationship between CO 2 assimilation rate and increasing light intensity on a plant, when carbon dioxide concentration is not a limiting factor. Fig. 1.2 (i) Explain why the CO2 assimilation rate plateaus at high light intensity. [3] (ii) Describe what is occurring at point A. [2] [Total: 10]

4 @YIJC 9744/02/PE/2023 2 An investigation was carried out to find the optimum pH and the optimum temperature of an amylase obtained from the bacterium Anoxybacillus thermarum. Fig. 2.1 shows the results of the investigation. Fig. 2.1 (a) With reference to Fig. 2.1, c ompare the effect of temperature on the activity of the amylase and the effect of pH on the activity of the amylase. [3] (b) Explain the percentage activity of amylase at X. [3] X

5 @YIJC 9744/02/PE/2023 [Turn over Table 2.1 shows the optimum pH and optimum temperature for amylase from different species of bacteria. Table 2.1 (c) (i) Using the data in