Mayflower 2019 Bio Prelim P2 QP

[Turn Over Name Reg. No Class MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL MAYFLOWERSECONDARY SCHOOL 4EX BIOLOGY 6093/02 Paper 2 Theory [80 Marks] PRELIMINARY EXAMINATION Additional Materials: Approved calculator September 2019 1h o u r4 5 m i n u t e s Instruction to Candidates Do not start reading the questions until you are told to do so. Write your name, class, and index number on all the work you hand in. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs or rough working. FOR EXAMINER’S USE Paper Marks Paper 1 (MCQ) /4 0 Paper 2 A / 50 B 6 / 10 7 / 10 8 / 10 Total / 120 Do not use paper clips, highlighters, glue or correction fluid. Section A Answer all questions. Write your answers in the spaces provided on the Question Paper. Section B Answer all questions. The last question is in the form of either/or. Write your answers in the spaces provided on the Question Paper. Electronic calculators may be used. You are advised to spend no longer than one hour on Section A and no longer than 45 minutes on Section B. 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. This question paper consists of 18printed pages. Setter: Mr Timothy Ng Vetter: Mrs Marie Huang www.KiasuExamPaper.com 346

2 Section A Answer allquestions in this section. Write your answers in the spaces provided. 1F i g . 1shows the leaves of the same plant during a drought. Fig. 1.1a shows the plant before it was watered and Fig. 1.1b shows the plant after it was watered daily for one week. Fig. 1.1a Fig. 1.1b (a) (i) Define the term transpiration. …………………………………………………………………………………………… ………………………………………………………………………………………… [1] (ii)Describe and explain two factors that would affect the rate of transpiration of the plant in Fig. 1.1a during a drought. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ………………………………………………………………………………………… [4] before watering after watering www.KiasuExamPaper.com 347

3 [Turn Over (iii)Suggest how wilting helps the plant to survive during a drought when water is in short supply. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ………………………………………………………………………………………… [2] (b)Name one process that takes place in Fig. 1.1bonly during the day. …………………………………………………………………………………………….... [1] (c) Fig. 1.2 shows the uptake and loss of oxygen by a leaf during a 24-hour period. Fig. 1.2 Explain the processes taking place in the leaf between 1800 hours and 2000 hours. ………………………………………………………………………………………………….. ………………………………………………………………………………………………….. ………………………………………………………………………………………………….. …………………………………………………………………………………………….... [2] [Total marks = 10] www.KiasuExamPaper.com 348

4 6 6.2 6.4 6.6 6.8 7 7.2 7.4 7.6 0 200 400 600 800 1000 1200 05 1 0 1 5 2 0 2 5 3 0 oxygen uptake / cm3 pH value in muscle 2F i g . 2 . 1below shows the changes in oxygen uptake and pH of the muscles of an athlete during a race. Fig. 2.1 (a)With reference to Fig. 2.1, (i)state the time that the athlete begins to incur an oxygen debt. ……………minutes [1] (ii)deduce the process that caused the changes in pH in his muscles. ………………………………………………………………………………………… [1] (iii)explain how the oxygen debt results in the changes in pH in his muscles. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ………………………………………………………………………………………… [3] time / minutes pH in musclesoxygen uptake / cm3 oxygen uptake / cm3 pH value in muscle www.KiasuExamPaper.com 349

5 [Turn Over (b)The increase in oxygen demand by the athlete was due to an increase in aerobic respiration in his muscles. State the word equation for aerobic respiration. …………………………………………………………………………………………….... [1] (c)Fig. 2.2shows a section of an alveolus. Fig. 2.2 (i)With reference to Fig. 2.2, describetwo ways that the structure of the alveoli is adapted to its function in gaseous exchange. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ………………………………………………………………………………………… [2] (ii)Describe the possible harmful effects of smoking cigarettes on the alveoli. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ………………………………………………………………………………………… [2] [Total marks = 10] www.KiasuExamPaper.com 350

6 3F i g . 3 . 1below shows a cross section of the heart from a person suffering from a heart defect known as “hole in the heart”. Fig. 3.1 (a)(i) Identify the blood vessels labelled Aand Bin Fig. 3.1. A: ……………………………… B: ……………………………… [2] (ii)Describe how the heart works to generate a heartbeat. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ………………………………………………………………………………………… [4] (iii)Predict how the heart defect will affect the lifestyle of this person. …………………………………………………………………………………………… …………………………………………………………………………………………… …………………………………………………………………………………………… ………………………………………………………………………………………… [2] Heart defect A B www.KiasuExamPaper.com 351

7 [Turn Over (b)Fig. 3.2shows pressure changes in the left side of the heart and aorta over time. The total length of a cardiac cycle is 0.8 seconds. Points 1, 2, 3 and 4 indicate when the atrio-ventricular valves and semilunar valves are either open or close. Fig. 3.2 (i) Circle on Fig. 3.2,t h e a r e a ( s ) o f t h e g r a p h w h e r e t h e a t r i o - v e n t r i c u l a r v a l v e s a nd the semi-lunar valves are both closed at the same time during the cardiac cycle shown. [1] (ii)Calculate how many times the heart described in Fig 3.2 will beat in oneminute. Number of heart beats per minute = ………………… [1] 1 2 3 4 www.KiasuExamPaper.com 352

8 (c)Fig. 3.3shows the transverse section of two types of blood vessels found i n t h e human circulatory system. Fig. 3.3 (i)Identify blood vessel Y. ………………………………………………………………………………………… [1] (ii)Describe the differences in the structures XandYas shown inFig. 3.3. …………………………………………………………………………………………… ………………………………………………………………………………………… [1] [Total marks = 12] X Y www.KiasuExamPaper.com 353

9 [Turn Over 4Fig. 4shows the model of how a kidney nephron function. Fig. 4 (a)Identify the labelled structures H,Iand