TKGS 2024 S4 Prelim Bio Paper 2

TANJONG KATONG GIRLS’ SCHOOL PRELIMINARY EXAMINATION SECONDARY FOUR EXPRESS CANDIDATE NAME CLASS 4 INDEX NUMBER BIOLOGY 6093/02 Paper 2 13 August 2024 1 hour 45 minutes Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your name, class and register number on all the work you hand in. Write in dark blue or black pen. You may use a HB pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided. Section B Answer one question. Write your answers in the spaces provided. The use of an approved scientific calculator is expected, where appropriate. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use Section A Setter : Mr Lim Kok Siong Markers : Mr Lim Kok Siong, Mrs Tan-Wong Woei Ling Section B Total / 80 This document consists of 22 printed pages.

2 Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2024 Section A Answer all questions. 1 Fig. 1.1 and Fig. 1.2 show the sections of alveoli and a villus respectively. Fig. 1.1 Fig. 1.2 (a) With reference to Fig. 1.1, describe one adaptation of an alveolus with respect to its function. …………………………………………………………………………………….…………… …………………………………………………………………………………….…………[1] (b) Cell A contains numerous small finger-like projections from the cell membrane. Name these projections. …………………………………………………………………………………….…………[1] (c) Structure B absorbs nutrients from the lumen of the small intestine. Name structure B. …………………………………………………………………………………….…………[1] (d) Name the substances that are absorbed into the blood capillaries of the alveoli and the villi. blood capillaries of the alveoli: ……………………………………………………………... blood capillaries of the villi: ……………………………………………………………….[2] [Total: 5] epithelial cells of alveoli blood capillary red blood cell blood capillaries cell A B

3 Tanjong Katong Girls’ School Sec 4 Preliminary Examination 2024 2 Fig. 2.1 shows a section of a mammalian heart. Fig. 2.1 (a) Describe one structural difference in the walls of vessels A and B. …………………………………………………………………………………………………. ……………………………………………………………………………………….………[1] (b) On Fig. 2.1, draw arrows to show the flow of blood inside the heart. [1] (c) Name valve X and explain its significance during ven