GMSS 2018 Bio Prelim P1 QP

___________________________________________________________ BIOLOGY Paper 1 6093/01 Sec 4 Express Additional materials:Optical Answer Sheet 1 hour Setter:Mrs Cheryl Tang 20 Aug 2018 READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, papers clips, highlighters, glue or correction fluid on the Optical Answer Sheet. Write your name, class and index number on the Optical Answer Sheet provided. There are fortyquestions on this paper. Answer allquestions. For each question, there are four possible answers, A, B, C andD. Choose the one you consider correct and record your choice in soft pencilon the separate answer sheet. 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. This document consists of 22printed pages. [Turn over Geylang Methodist School (Secondary) Preliminary Examination 2018 www.KiasuExamPaper.com 276

2 GMS(S)/BiologyP1/Prelim2018/4E 1 The diagram below shows a plant cell in a leaf of a tree. Which of the following correctly shows the pathway involving the synthesis of a protein molecule needed for the development of a fruit? A 1Æ2Æ5Æ4 B 1Æ6Æ5Æ9 C 2Æ5Æ7Æ1 D 7Æ1Æ2Æ5 2 The diagram shows blood passing through an arteriole into a capillary. Part of the capillary wall has been cut away to show the blood. What is the level of organisation of the structures labelled P and Q? P Q A organ cell B organ tissue C tissue cell D tissue tissue 1 2 3 4 5 6 7 8 9 www.KiasuExamPaper.com 277

3 GMS(S)/BiologyP1/Prelim2018/4E 3 Strips of plant tissue were immersed in a range of sucrose solutions of different concentrations. Their lengths were measured before immersion and after 30 minutes in the different solutions. The graph shows the ratio of their initial length to final length. Which concentration of sucrose solution, in mol dm-3, has the same water potential as the cell sap before immersion? A 0.10 B 0.25 C 0.45 D 0.80 4 Where and how does carbon dioxide enter a plant? where how A B C D root hair cells root hair cells stomata stomata active uptake diffusion active uptake diffusion www.KiasuExamPaper.com 278

4 GMS(S)/BiologyP1/Prelim2018/4E 5 The diagram shows a biological molecule. What type of molecule is this likely to be? A fat B glycogen C protein D sucrose 6 A mixture of food gives the following results on testing: a purple colour in the biuret test; a blue colour when heated with Benedict's solution; a yellow colour with iodine; a white emulsion with ethanol. What does the mixture contain? A fat and protein B protein and reducing sugar C reducing sugar and starch D starch and fat 7 Protease enzyme breaks down protein to amino acids. In the ‘lock and key’ hypothesis, what is the lock and what is the key? lock key A B C D amino acid protease protease protein protease amino acid protein protease www.KiasuExamPaper.com 279

5 GMS(S)/BiologyP1/Prelim2018/4E 8 Four flasks labelled Q, R, S and T were prepared. The contents of each flask are given in the table below. flask contents of flask experiment temperature (°C) Q 20 cm3of starch + 5 cm3salivary amylase 35 R 20 cm3of starch + 2 cm3salivary amylase 35 S 20 cm3of starch + 5 cm3boiled salivary amylase 35 T 20 cm3of starch + 5 cm3salivary amylase 10 Equal volumes of samples from each flask were obtained and tests for starch were done at 5-minute intervals. Each experiment was carried out over a time span of 25 minutes. The results of the experiments are shown in the graph. Which of the following shows the accurate trends for reactions in flasks Q and S? Q S A B C D 4 1 3 3 1 4 1 2 www.KiasuExamPaper.com 280

6 GMS(S)/BiologyP1/Prelim2018/4E 9 Rachel has a damaged liver due to excessive drinking. Many functions of the body will be affected. Which of the following function will not be affected? A secretion of digestive enzymes B formation of urea C production of bile D formation of glycogen 10 The graph shows the changes in blood glucose concentration during periods of rest and exercise. What causes the change in blood glucose level between Xand Y? glucagon secretioninsulin secretion glycogen stored in liver A B C D decreases decreases increases increases increases increases decreases decreases increases decreases decreases increases www.KiasuExamPaper.com 281

7 GMS(S)/BiologyP1/Prelim2018/4E 11 The graph shows how the rate of photosynthesis of a plant varie s with light intensity at two different carbon dioxide concentrations. The temperature is kept constant at 20 °C. Which factor is limiting the rate of photosynthesis at point X? A availability of chlorophyll B availability of water C concentration of carbon dioxide D intensity of light 12 The chart below shows the distribution of stomata on the upper and lower epidermis of the leaves of four plants. Which of these plants would be found floating on the surface of a pond? upper epidermis lower epidermis KEY: 8900 29400 2500 02300 30000 20000 10000 0 No. of stomata per cm2 upper epidermis lower epidermis 0 0 3 4 AB C D X www.KiasuExamPaper.com 282

8 GMS(S)/BiologyP1/Prelim2018/4E 13 The diagram shows pressure changes in the left side of the heart during part of the human cardiac cycle. At which point do the atrioventricular valves open? 14 The diagram below shows the mammalian blood vessels connected with the small intestines and the liver. Which of the following is correct? blood vessel X blood vessel Y A B C D more urea more oxygen more carbon dioxide valves present less urea less oxygen less carbon dioxide valves absent small intestine liver X Y www.KiasuExamPaper.com 283

9 GMS(S)/BiologyP1/Prelim2018/4E 15 The life span of red blood cells is approximately 120 days. New red blood cells are released into the bloodstream from the bone marrow. Unlike typical cells in the body, they do not reproduce by mitosis. What is the likely explanation for this? A Red blood cells have haemoglobin which inhibits cell division. B Red blood cells move around constantly, so they are not able to r emai n stationary for cell division to occur. C Red blood cells have lost their nuclei, so they are not able to carry out cell division. D Red blood cells are too small for cell division to take place. 16 The 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 have a variety of symptoms, such as decreased growth rates, stunted growth, low yields and death. Which of the following pairs 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 symptoms due to low levels of manufactured food substances left for Tilia plant. branch of Tilia aphid undigested sap www.KiasuExamPaper.com 284

10 GMS(S)/BiologyP1/Prelim2018/4E 17 A plant was enclosed in an environment that contained radioactive carbon dioxide for 24 hours. The leaf, stem and root of the plant was then sectioned to detect radioactivity. The diagram below shows a leaf, stem and root of the plant. Which of the numbered parts would show radioactivity? leaf stem root A B C D 1 1 2 2 3 4 3 4 5 5 6 6 18 The graph shows the concentration of lactic acid in the blood vessel leaving the leg muscle of a runner before, during and after a race. What is the concentration of lactic acid 15 minutes after the race has finished? A 32 mg/cm3 B 46 mg/cm3 C 70 mg/cm3 D 92 mg/ cm3 beginning of race lactic acid /