NYGH 2013-S3EOY-Bio P2

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2013 Secondary Three BIOLOGY Paper 2 Theory Paper 1 hour 45 minutes Tuesday 8 October 2013 0915 - 1100 Additional materials: Writing papers READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name, register number and class in the spaces at the top of this page and on any separate answer paper used. Section A (40 marks) Answer all questions. Write your answers in the spaces provided on the question paper. Section B (30 marks) Answer all questions including questions B1, B2 and B3 Either or B3 Or. Write your answers on the separate writing paper provided. At the end of the examination, 1. fasten all your work securely together; 2. tick B3 Either (for Either) or B3 Or (for Or) next to the question number B3 in the grid below to indicate which question you have answered. INFORMATION FOR CANDIDATES Examiner’s Use Section A Section B B1 B2 B3 Either B3 Or Total The intended number of marks is given in the brackets [ ] at the end of each question or part question. You are advised to spend no longer than one hour on Section A and no longer than 45 minutes on Section B. Setters: DN, LCP, BK & ST This document consists of 14 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over

2013 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setters: DN, LCP, BK & ST Biology /II Section A Answer all questions. Write your answers in the spaces provided. A1 Fig. A1 shows the diagram of an organism. Fig. A1 (a) “This organism displays both plant-like and animal-like properties.” Which of the labeled structures support this statement? [ 1 ] Plant-like: Animal-like: (b) Suggest how the presence of the animal-like structure in (a) helps to increase its ability to survive. [ 1 ] (c) In the absence of light, the organism in Fig. A1 may feed by taking in foreign particles through phagocytosis. Draw a diagram to explain the process of phagocytosis of the foreign particles. [ 2 ]

2013 End- of-Year Examination Secondary Three 3 Nanyang Girls’ High School Setters: DN, LCP, BK & ST Biology /II [Turn over (d) Suggest the fate of the foreign particles after phagocytosis, using information from Fig. A1. [ 1 ] Total [ 5 ] A2 Fig. A2 below shows the substrates of a condensation reaction to form a triglyceride. Fig. A2 (a) In the space below, draw the final products of such a condensation reaction. [ 2 ] (b) In your drawing in (a), circle and name the bond formed from the condensation reaction. [1] glycerol 3 fatty acids

2013 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School Setters: DN, LCP, BK & ST Biology /II (c) You are provided with two solutions containing different concentrations of fructose (Solution A and Solution B), and one solution of known concentration (Solution C). Describe how you would carry out an experiment to determine the concentrations of fructose in Solutions A and B. [ 4 ] Total [ 7 ]

2013 End- of-Year Examination Secondary Three 5 Nanyang Girls’ High School Setters: DN, LCP, BK & ST Biology /II [Turn over A3 Fig. A3 shows the activity of a commercial protease enzyme Alcalase at different pH values, at 35 C. Fig. A3 (a)(i) Draw on Fig. A3, the pH curve of pepsin, a digestive enzyme found in the human stomach. [ 1 ] (a)(ii) How does this curve compare to the pH curve of pepsin, a digestive enzyme found in the human stomach? [ 1 ] (b) What change in conditions would allow for an increase in the rate of reaction at pH 7? [ 1 ] Total [ 3 ] pH rate of reaction / arbitrary units

2013 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School Setters: DN, LCP, BK & ST Biology /II A4 Fig. A4 shows an electron micrograph of a chloroplast in a section of plant cell. Fig. A4 (Source from http://bioweb.wku.edu/courses/biol22000/11Organelles/Fig.html) (a) Identify structure X and structure Y in the chloroplast. [ 1 ] Structure X = ____________________ Structure Y = _________________ (b) Identify structure Z that is only found in the chloroplast in the daytime. [ 1 ] Structure Z = ____________________ (c) When chlorophyll in an intact chloroplast gets excited with light, an electron is released and is passed along the inner membrane and the chlorophyll does not glow. Suggest a reason why in the laboratory, a chlorophyll solution that is isolated from the chloroplast will fluoresce with a red-orange glow when excited with light. [ 3 ] Total [ 5 ] X Y Z

2013 End- of-Year Examination Secondary Three 7 Nanyang Girls’ High School Setters: DN, LCP, BK & ST Biology /II [Turn over A5 Fig. A5 shows a cross section of a dicotyledonous stem. Fig. A5 (Source from flickr photo - Dicot stem by Shihchuan) (a) Mark and label on Fig. A5 the tissue that transports water. [ 1 ] (b) (i) (ii) A common stem parasite is the mistletoe plant. After the black bird Phainopepla nitens eats the berries of the desert mistletoe Phoradendron californicum, the seeds will be dispersed in the bird droppings on a new stem. Mark and label on Fig. A5 the tissue where the seed will be getting its food. Suggest how the seed can steal all of its food from the stem. [ 1 ] [ 2 ] Total [ 4 ]

2013 End-of-Year Examination Secondary Three 8 Nanyang Girls’ High School Setters: DN, LCP, BK & ST Biology /II 100 mg/dl 70 mg/dl A6 Fig. A6 shows the blood glucose level of a person over a period of time A – D. Fig. A6 A B C D Time (hrs) (a) State the time(s) insulin is probably released into the body. Give an explanation for your answer. [ 2 ] (b) Give an explanation for what happens at time D. [ 2 ] Total [ 4 ] Normal sugar level

2013 End- of-Year Examination Secondary Three 9 Nanyang Girls’ High School Setters: DN, LCP, BK & ST Biology /II [Turn over A7 (a) Explain how clotting occurs. [ 3 ] (b) How is the body able to prevent clotting from occurring within the vessels? [ 2 ] (c) Predict the tendency of clot formation to be increased or decreased if fat is being deposited inside the vessel wall. Explain your answer. [ 1 ] Total [ 6 ]

2013 End-of-Year Examination Secondary Three 10 Nanyang Girls’ High School Setters: DN, LCP, BK & ST Biology /II A8 (a) The human body is described as having double circulation. Describe what double circulation means. [ 1 ]