MI 2023 J2 H2 BI Prelim P3 ANS

Class Adm No Candidate Name: ___________________________________ This question paper consists of 21 printed pages, including 1 blank page. [Turn over] 2023 End-of-Year Examination Pre-University 3 H2 Biology 9744/03 Paper 3 Long Structured and Free-response Questions 20 September 2023 2 hours READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your Admission 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 or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid. Section A Answer all questions in the spaces provided on the Question Paper. Section B Answer any one question 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. For Examiner’s Use Section Question Marks A 1 /30 2 /10 3 /10 B 4/5 /25 Total Marks /75

2 9744/03/PU3 EOY/2023 Section A Answer all questions in this section. 1 The tomato plant (Solanum lycopersicum) is a crop harvested in many regions of the world for its edible fruit. Its red skin is primarily due to the presence of the organic compound lycopene, a pigment also found in many other fruits such as carrots and watermelon. Lycopene is only made up of carbon and hydrogen, as shown in Fig. 1.1. Lycopene is also a precursor to many carotenoids, which absorb light from a certain wavelength during photosynthesis. In addition to carotenoids, other essential pigments are chlorophylls a and b. Fig. 1.1 (a) (i) Suggest a cellular structure in which lycopene can be found in a tomato cell. Explain your answer. ………………………………………………...…………………………………………. ………………………………………………...…………………………………………. ………………………………………………...…………………………………………. ………………………………………………...……………………………………... [2] 1. Cell surface membrane/mitochondrial membrane/membrane of endoplasmic reticulum/membrane of Golgi apparatus; 2. Carbon and hydrogen in lycopene allow favourable hydrophobic interaction with hydrophobic fatty acid tail /hydrophobic core of lipoproteins

3 9744/03/PU3 EOY/2023 [Turn over] Fig. 1.2 shows the absorption spectrum of lycopene and the action spectrum of the tomato plant. Fig. 1.2 (ii) With reference to Fig. 1.2, state the wavelength(s) of peak absorption by lycopene. ………………………………………………...……………………………………... [1] (iii) Explain how the data in Fig. 1.2 shows that lycopene is not the only photosynthesis pigment in the tomato plant. ………………………………………………...…………………………………………. ………………………………………………...…………………………………………. ………………………………………………...…………………………………………. ………………………………………………...…………………………