NYGH 2010-S3EOY-Bio P2

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2010 Secondary Three BIOLOGY 1 hour 45 minutes Paper 2 Theory Paper 0915 - 1100 Thursday 14 October 2010 Additional materials: Writing papers, graph paper 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 5, 6 and 7 Either or 7 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 7 Either or 7 Or in the grid below to indicate which question you have answered. Hand in Section A and Section B separately. INFORMATION FOR CANDIDATES Examiner’s Use Section A Section B 5 6 7 Either 7 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: KHN, OC, BK This document consists of 11 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over

2010 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Setters: KHN, OC, BK Biology /II Section A Answer all questions. Write your answers in the spaces provided. A1 Fig. 1.1 shows the nutrition information of a brownie. Nutrition facts Serving size 1 each 66 g Calories 302 Total fat 15g Saturated fat 5g Cholesterol 36mg Sodium 147mg Total carbohydrate 41g Dietary fibre 2g Sugars 28g Protein 4g Fig. 1.1 Mr Lim is a teacher in a school. For teachers' day, he received one brownie each from 20 different students. He finished all the brownies within 12 hours of receiving them. (a) (i) Calculate the amount of cholesterol that he has consumed (in grams) within that 12 hours. [1] (ii) State the assumption made in such a calculation. [1] (iii) State one use of cholesterol. [1]

2010 End- of-Year Examination Secondary Three 3 Nanyang Girls’ High School Setters: KHN, OC, BK Biology /II [Turn over (b) (i) One brownie contains 23% of a person’s requirement of fat for one day. What advice would you give to Mr Lim regarding the rate at which he consumes the brownies? Assume that he will finish all the brownies. [1] (ii) State the reason for your answer in (b) (i). [1] (c) Describe how to test for sugars in the brownie. [2] (d) Mr Lim plays basketball regularly. Suggest a suitable diet for him, and state reasons for your suggestions. [3] Total [10]

2010 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School Setters: KHN, OC, BK Biology /II A2 (a) Fig. 2.1 shows the stages of holozoic nutrition. Fig. 2.1 Identify processes P and Q. [2] P Q (b) (i) The table below describes some aspects of digestion. Put a tick (9) for yes and a cross (8) for no to indicate if it applies to mechanical and/or chemical digestion. Do not leave blanks. [2] Difference Mechanical digestion Chemical digestion There is a change in the chemical composition of food. The digestion involves enzyme(s). (ii) Is chewing a form of mechanical or chemical digestion? [1] (c) The table shows descriptions of some digestive glands. Complete the table with appropriate answers. [5] Description Digestive gland Position of gland in relation to digestive tract (outside or within) Substances that the digestive gland secretes salivary gland outside salivary amylase ________________ outside bile pancreas outside pancreatic amylase, trypsin and __________________ gastric gland within hydrochloric acid and enzymes like pepsin and ______________ ________________ _____________________ intestinal juice that contains maltase, sucrase, lactase and erepsin Total [10] QP Food (large complex insoluble molecules) Chemical digestion (enzymes in stomach and small intestine) Mechanical digestion (teeth and muscle actions) Faeces (undigested food, dead cells from the gut and bacteria) Products of digestion absorbed into blood circulation in small intestine, then into cells

2010 End- of-Year Examination Secondary Three 5 Nanyang Girls’ High School Setters: KHN, OC, BK Biology /II [Turn over A3 Fig. 3.1 shows a sectional view of the rib-cage with the structures associated with breathing. Fig 3.1 (a) Describe and explain what causes air to enter the lungs. Use the following words in your answer: diaphragm; intercostal muscles; pressure; volume. [4] (b) (i) The wall of the trachea has rings of cartilage in it. State a function of these rings of cartilage. [1]

2010 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School Setters: KHN, OC, BK Biology /II (ii) The lining of the trachea contains ciliated cells. State the function of these cells. [1] (c) (i) As air moves into the lungs, it enters the alveoli. Name the process by which oxygen passes from the air in the alveoli to the blood. [1] (ii) State three ways in which the alveoli in the lungs are adapted for gaseous exchange. [3] 1. 2. 3. Total [10]

2010 End- of-Year Examination Secondary Three 7 Nanyang Girls’ High School Setters: KHN, OC, BK Biology /II [Turn over A4 (a) The concentration of sulfate ions was measured in the roots of barley plants and in the water in the surrounding soil. Table 4.1 shows the results. Area Concentration of sulfate ions in mmol per dm3 Roots of barley plants 1.2 Soil 0.15 Table 4.1 Is it possible for the barley roots to take up sulfate ions from the soil by diffusion? Explain your answer. [2] (b) Some scientists investigated the amount of sulfate ions taken up by barley roots in the presence and absence of oxygen. Fig 4.1 shows the results. Fig 4.1

2010 End-of-Year Examination Secondary Three 8 Nanyang Girls’ High School Setters: KHN, OC, BK Biology /II (i) Fig. 4.1 shows that the rate of sulfate ion uptake between 100 and 200 minutes, without oxygen, was 0.4 arbitrary units per minute. The rate of sulfate ion uptake between 100 and 200 minutes, with oxygen, was greater. Calculate the increase in the rate of uptake. Show your working clearly. [2] (ii) The barley roots were able to take up more sulfate ions with oxygen than without oxygen. Explain why. [3] (iii) Explain the significance of sulfate ion uptake by barley roots with respect to the uptake of water by the barley plant. [3] Total [10]

2010 End- of-Year Examination Secondary Thre