SCGS 2017 Bio Prelim P2 MS

1 CANDIDATE NAME CLASS 4 REGISTER NUMBER CENTRE NUMBER INDEX NUMBER BIOLOGY Paper 2 Theory 5158/02 1 hour 45 minutes READ THESE INSTRUCTIONS FIRST Write your class, index number and name on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams or graphs. Do not use staples, paper clips, highlighters, glue or correction fluid/tape. Section A Answer all questions. Section B Answer all questions, the last question has a choice of parts to answer. The use of an approved scientific calculator is expected, where appropriate. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. Vivian 2,3,4,6,9,10,13E/O [total 40m] Jo 1,5,7,8,11,12 [total 40m] This question paper consists of 29 printed pages. SINGAPORE CHINESE GIRLS’ SCHOOL Preliminary Examination Secondary Four For Examiner’s Use Section A 50 Section B 30 Total 80 Tuesday 1 August 2017 1 hour 45 minutes answers

2 Section A Answer all the questions. Write your answers in the spaces provided. 1 (a) Name a constituent of a diet that is [1] (i) absorbed without digestion, ……………………………………………… (ii) never absorbed. ……………………………………………… Fig. 1.1 is a diagrammatic representation of the small intestine containing three types of food molecules, A, B and C before they have been fully digested. Fig. 1.1 also shows a lacteal and a capillary, both not drawn to scale. Fig. 1.1 (b) On Fig. 1.1, draw and label the molecules as they would appear after they have been fully digested and then absorbed by the lacteal and by the blood capillary. [1] A B C Water / mineral salt / vitamins, glucose (or monosac) fibre / roughage / cellulose / fruits / seeds

3 (c) Some of these molecules travel directly to the liver. Name two molecules and explain how they are transported to the liver. [2] …………………………………………………………………………………………. …………………………………………………………………………………………. (d) Describe how A is completely digested by named enzymes in the small intestine. [2] …………………………………………………………………………………………. …………………………………………………………………………………………. [Total : 6m] Glucose and amino acids; In plasma / solution / blood via hepatic portal vein A (starch) is digested by pancreatic amylase to maltose, Maltose is digested by intestinal maltase to glucose.

4 2 Fig. 2.1 shows a large jar in which plants are growing. Fig. 2.1 This jar provides an environment in which plants can carry out photosynthesis without adding water or removing the tightly-fitting cork to allow air to enter. (a) State the word equation for photosynthesis in the space belo