Zhonghua 2019 Bio Prelim P2 QP

ZHONGHUA SECONDARY SCHOOL PRELIMINARY EXAMINATION 2019 SECONDARY 4E Candidate’s Name Class Register Number 4E4 BIOLOGY 6093 /02 19 September 2019 1 hour 45 minutes Additional Materials: READ THESE INSTRUCTIONS FIRST Write your name, index number and class in the spaces at the top of this page and on all separate answer paper used. Write in dark blue or black pen. You may use a pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. Section A Answer allquestions. Write your answers in the spaces provided on the question paper Section B For Examiner’s Use Answer all three questions, the last question is in the form either/or. Write your answers in the spaces provided on the question paper. Section A 50 B8 10 You are advised to spend no longer than one hour on Section Aand no longer than 45 minutes on Section B. B9 10 B10 10 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. All essential working must be shown clearly. Total 80 Setter: Ms Rozianna Vetter: Mr Goh Tze Mian This document consists of 18printed pages, including this cover page. www.KiasuExamPaper.com 548

2 Total marks Section A Answer allthe questions. Write your answers in the spaces provided on the question paper. 1Large trees produce sun leaves on the outside of the canopy and shade leaves inside the canopy. Fig. 1.1 shows the rate of carbon dioxide uptake or production of a sun leaf and a shade leaf when exposed to increasing light intensity. Fig. 1.1 (a)Draw a line and letter X to label the light intensity at which the rate of respiration is equal to the rate of photosynthesis in the shade leaf on Fig. 1.1. [1] (b)With reference to Fig. 1.1, describe two ways in which the sun and shade leaf differ in their response to increasing light intensity. 1 2 [2] www.KiasuExamPaper.com 549

3 Total marks (c)Fig. 1.1 shows the results taken at a temperature of 20°C. Describe the effect on the sun leaf if the temperature was increased to 25°C. [3] (d)Outline an experimental plan to investigate the effect of carbon dioxide concentration on rate of photosynthesis. [3] [Total: 9] 2Fig.2.1 shows the series of events in a cardiac cycle of a man. The outer ring of the circle (Ato H) represents the sequence of events in the ventricles, while the inner ring (ato h) represents events in the atria. Fig. 2.1 systole (contraction) diastole (relaxation) 0.1 s AB C D E F G H a bc d e f g h www.KiasuExamPaper.com 550

4 Total marks (a)Calculate the heart rate of the man in beats per minute. Show your working. [1] (b)Identify the period (AtoH), at which (i) blood flows from the atria into the ventricles [1] (ii)the semi-lunar valves close [1] (c)Describe the events that occur in the heart during the period Ato C