Zhonghua 2019 Bio Prelim P1 QP

ZHONGHUA SECONDARY SCHOOL PRELIMINARY EXAMINATION 2019 SECONDARY 4E Candidate’s Name Class Register Number 4E4 BIOLOGY 6093 /01 20 September 2019 1 hour Additional Materials: OTAS READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name, index number and class on the OTAS in the spaces provided. There are fortyquestions on this paper. Answer all questions. For each question there are four possible answers A,B,Cand D. Choose the one you consider correct and record your choice in soft pencil on the separate OTAS. Read the instructions on the Answer Sheet very carefully. Each correct answer will score one mark. A mark will not be deducted for a wrong answer. Any rough working should be done in this booklet. Total 40 Setter: Ms Rozianna Vetter: Mr Goh Tze Mian This document consists of 20printed pages, including this cover page. www.KiasuExamPaper.com 528

2 Section A Answer allquestions in the OTAS. 1 The diagram shows a typical animal cell with cell components involved in the synthesis and secretions of an enzyme. Which is the correct route taken by an amino acid molecule during enzyme production? A 2Æ3Æ4Æ1 B 2Æ4Æ3Æ1 C 3Æ2Æ1Æ4 D 3Æ4Æ2Æ1 2 The diagram shows a freshwater single-celled organism. Which of the statements correctly identifies structures 1 to 4 and its function? 1 smooth endoplasmic reticulum synthesises fats and steroids 2 chromosomes control polypeptide synthesis 3 Golgi body synthesizes proteins 4 chloroplast captures light energy for photosynthesis A 1, 2, 3 and 4 B 1, 3 and 4 C 2o n l y D 2 and 3 g g 1 2 3 4 www.KiasuExamPaper.com 529

3 3 Concentrated starch solution is added into a cow’s urinary bladder until it is half full. The bladder is tied, weighed and then placed in a dilute starch solution. The weight of the urinary bladder is taken every hour. Which graph best reflects these results? 4 The diagram shows a xerophytic leaf in different conditions, Pand Q. X X condition P condition Q Which statements about the cells of the leaf in conditions Pand Qare correct? 1w a t e r p o t e n t i a l i n c o n d i t i o n Pis higher than in condition Q 2 cells may be turgid in condition Pand plasmolysed in condition Q 3 turgidity of cells in condition Pis lesser than in condition Q 4 no net diffusion of water into cells in layer Xin either condition Por Q A 1 and 4 B 2 and 3 C 1, 2 and 4 D 1, 2, 3 and 4 A B C D www.KiasuExamPaper.com 530

4 5 Five disaccharides were each hydrolysed with dilute acid and the purified products were separated by chromatography. The results are shown below. 12 34 5 The spots from 1 represent the products obtained from the hydrolysis of sucrose. Which represents the results obtained from the hydrolysis of lactose and maltose? lactose maltose A 23 B 24 C 52 D 5 3 6 Lipase catalyses the conversion of fats into fatty acids and glycerol. lipase fats fatty acids + glycerol Three different enzyme inhibitors of lipaseX,Yand Z, which prevent the above reaction from occurring, were investigated. The percentage inhibition of lipase was measured at different co ncentrations of inhibitor. The graph shows the results of the investigation. inhibitor concentration / arbitrary units www.KiasuExamPaper.com 531

5 Which is/are valid conclusion(s) from these results? 1 The higher the concentration of inhibitor X, the lesser the amount of fats is broken down. 2T h e p r o d u c t i o n o f f a t t y a c i d s a n d g l y c e r o l u s i n g i n h i b i t o r Yis higher than when inhibitor Zis used. 3 The production of fatty acids and glycerol at an inhibitor concentration of 2 arbitrary units is lower than at an inhibitor concentration of 4 arbitrary units, for all inhibitors. A1 only B 3 only C1 and 2 D2 and 3 7 The graph shows energy changes during an enzyme-catalysed chemical reaction. Which graph shows the energy changes for the same reaction when the enzyme is absent? 8 The diagram shows some chemical reactions that occur in plants. Which stage/s depend/s on the use of nitrate ions as a raw material? A 1 only B 2 only C 1 and 3 D 2 and 3 www.KiasuExamPaper.com 532

6 10The plant was placed in a glass jar containing radioactive carbon dioxide and then exposed to sunlight. In which order would radioactivity be detected in the leaf? A 1, 5, 2 B 1, 5, 4 C 5, 2, 4 D 5, 4, 3 11Which process is an example of assimilation? A formation of carbon dioxide from glucose B formation of cell membranes using lipids C formation of sweat from blood plasma D formation of urea from amino acids Refer to the diagram of a dicotyledonous leaf to answer questions 9and10. 9 A drop of concentrated salt solution was placed on the surface of the leaf at 1. Which statement describes the movement of water molecules between the salt solution and the plant cells in the leaf? AThere is no movement of water molecules between the salt solution and the plant cells. BThere is no net movement of water molecules between the salt solution and the plant cells. CWater molecules move from the plant cells into the salt solution by osmosis. DWater molecules move from the salt solution into the plant cells by osmosis. www.KiasuExamPaper.com 533

7 12In patients with cystic fibrosis, thick mucus blocks the pancreatic duct. Which are possible effects of this blockage? 1e g e s t i n g o i l y s t o o l 2 weight loss 3m a l n o u r i s h m e n t 4h y p e r g l y c e m i a ( h i g h b l o o d g l u c o s e ) A 1 and 3 B 1, 2 and 3 C 1, 3 and 4 D 2 and 3 13 The graph shows stomatal opening and closing in leaves during a 24-hour period. What can be concluded from the graph? A Gaseous exchange occurs when stomata are open. B Stomata open as light intensity increases. C Gaseous exchange does not occur in the dark. D Transpiration does not occur in the dark. www.KiasuExamPaper.com 534

8 14The photomicrograph shows an aphid feeding on a branch of a woody tree, Tilia. The fluid extracted by the aphid consists of sieve element sap. The high turgor pressure in the sieve element forces the cell contents through the food canal of the aphid. Once every 30 minutes, a droplet of undigested sap exits from the aphid. Plants exhibiting extensive aphid damage can display a variety of symptoms, such as decreased growth rates, stunted growth, low yields and death. Which pair of observation and explanation is correct? observation explanation A sieve element sap rich in solutes, especially sucrose and amino acids B high turgor pressure in sieve element numerous mitochondria in sieve tubes to carry out active transport C undigested sap product of defecation and not excretion D variety of symptomsdue to low levels of manufactured food substances left for Tilia plant 15Blood samples from three veins in the body were tested for the concentration of oxygen, carbon dioxide and urea. The results, in arbitrary units, are shown in the table. vein oxygen concentration carbon dioxide concentration urea concentration 14 04 81 .3 24 04 87 .5 39 04 03 .9 What are the identities of the three veins? hepatic vein pulmonary vein renal vein A 132 B 231 C 312 D 321 www.KiasuExamPaper.com 535

9 17The table shows the results of a blood test of three volunteers, P, Q and R for blood transfusion. donor PQ R recipient P agglutination no agglutination Qn o a g g l u t i n a t i o n no agglutination Ra g g l u t i n a t i o n a g g l u t i n a t i o n Which of the following may be the blood types of volunteers P and Q? PQ A AA B B AO C BB D OA B 16The graph below shows the pressure changes in the left side of the heart. The