NYGH 2020-S3EOY-Bio P2B

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2020 Secondary Three BIOLOGY Paper 2 Theory Paper 1 hour 45 minutes Monday 12 October 2020 1000 – 1145 Additional materials: Nil READ THESE INSTRUCTIONS FIRST Do not open this document until you are told to do so. Write your name, register number and class in the spaces at the top of this page. Section B Answer three questions. Question 10 is in the form of an Either/Or question. Only one part should be answered. Write your answers in the spaces provided on the question paper. At the end of the examination, tick 10 Either or 10 Or in the grid-box to indicate the question answered. You are advised to spend no longer than 1 hour on Section A, and no longer than 45 minutes on Section B. The intended number of marks is given in the brackets [ ] at the end of each question or part question. The use of an approved scientific calculator is expected, where appropriate. Setter: TZZ This document consists of 7 printed pages and 1 blank page. NANYANG GIRLS’ HIGH SCHOOL [Turn over B

2020 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School IP Biology Section B Answer three questions. Question 10 is in the form of an Either/Or question. Only one part should be answered. Write your answers in the spaces provided on the question paper. 8 A student set up the apparatus shown in Fig. 8.1 to investigate the effect of temperature on the rate of photosynthesis in hydrilla. Fig. 8.1 The number of bubbles produced by the leaves in five minutes was recorded. The temperature of the water bath was changed and the experiment was repeated without changing the distance of the lamp from the hydrilla. The results of the experiment are shown in Table 8.1. Table 8.1 temperature/ °C number of bubbles produced in five minutes number of bubbles produced in one minute 20.0 25 5 25.0 29 6 30.0 58 12 35.0 144 30 40.0 188 38 45.0 161 32 50.0 95 19 water bath hydrilla lamp sodium hydrogencarbonate solution thermometer stopwatch bubble

2020 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School IP Biology [Turn over (a) Define enzyme. …………………………………………………………………………………………......... ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. [1] (b) (i) Plot a graph to represent the data in Table 8.1, using the grid provided. You may omit the title of the graph. [4]

2020 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School IP Biology (ii) Explain the shape of your graph. ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… ………………………………………………………………………………………… [4] (c) The experiment was repeated with a light bulb of a higher wattage. The results of the experiment were plotted. Predict the change to the graph you have drawn in (b)(i). ……………………………………………………………………………………………….. ……………………………………………………………………………………………….. [1] [total: 10]

2020 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School IP Biology [Turn over 9 (a) (i) Describe the structure of a triglyceride molecule. .…………………………………………………………………………………… …………………………………………………………………………………… …………………………………………………………………………………… …………………………………………………………………………………… …………………………………………………………………………………… …………………………………………………………………………………… …………………………………………………………………………………… …………………………………………………………………………………… [4] (ii) Describe the alcohol emulsion test in detail and state the observed positive result. …………………………………………………………………………………… ………………………………………………………………………….……….. ……………………………………………………………………………..…..… ……………………………………………………………………………….…… ………………………………………………………………………………….… ……………………………………………………………………………….…… [3] (b) Explain the advantages of storing excess glucose as glycogen. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. [3] [total: 10]

2020 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School IP Biology Question 10 is in the form of an Either/Or question. Only one part should be answered. 10 Either (a) Describe the events involved in the complete digestion of deep-fried chicken cutlet, starting from the stomach to the small intestines. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. [5] (b) Explain the structural adaptation of the small intestine for absorption of digested food nutrients. ………………………………………………………………………………………….. ………………………………………………………………………………………….. …………………………………………………………………………………………. ………………………………………………………………………………………….. ……………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. [5] [total: 10]

2020 End-of-Year Examination Secondary Three 7 Nanyang Girls’ High School IP Biology [Turn over 10 Or (a) Describe how a leaf is adapted for photosynthesis. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. [6] (b) A well-watered plant was left in bright sunlight for five hours. Describe and explain the steps involved in testing if the plant has photosynthesised. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. [4] [total: 10] End of Paper 2 Booklet B

2020 End-of-Year Examination Secondary Three 8 Nanyang Girls’ High School IP Biology Blank Page