Sec 4 Science Biology SA2 2018 Fajar QP

Do not open this document till permission is given. This document consists of 11 printed pages and1 blank page. FAJAR SECONDARY SCHOOL 2018 PRELIMINARY EXAMINATIONS SECONDARY 4 EXPRESS/5 NORMAL (ACADEMIC) CANDIDATE NAME CLASS INDEX NUMBER SCIENCE (BIOLOGY) Paper 1 Multiple Choice Setter: Ms Seah AH Additional Materials: OTAS Sheet 5077/5078 Date: 13 September 2018 Duration: 1 Hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, highlighters, glue or correction fluid. Write your name and index number on the Question Paper and OTAS Sheet in the spaces provided. There are twenty questions on this paper. Answer all questions. For each question there are four possible answers A, B, C and D. Choose the one you consider correct and record your choice in soft pencil on the separate OTAS Sheet. 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. The use of an approved scientific calculator is expected, where appropriate. www.KiasuExamPaper.com 123

2 1 The diagram below shows the initial diameter of a potato disc. The potato disc was placed in distilled water for one hour. Which diagram correctly shows the change in the diameter of the potato disc? A B C D 2 The diagram shows part of a plant root in the soil. The root is absorbing water. At which labelled point is the water potential highest? potato disc 1 cm 1 cm xylem root hair cell soil particleA B C D www.KiasuExamPaper.com 124

3 [Turn over 3 A solution gives the following results when tested. What does the solution contain? test observations biuret test solution changed from blue to violet Benedict’s test solution changed from blue to brick red precipit ate iodine solution solution remained yellow ethanol emulsion test solution remained clear A fat and protein B protein and reducing sugar C protein and starch D reducing sugar and starch 4 The graph shows how temperature affects the rate at which an enzyme works. What does the graph show about this enzyme? A The enzyme is denatured by temperatures above 65 oC. B The enzyme is denatured by temperatures below 8 oC. C The enzyme works fastest at 55 oC. D The enzyme works fastest at 61 oC. rate of enzyme activity 0 5 10 15 20 25 30 35 40 45 50 55 60 65 temperature / oC www.KiasuExamPaper.com 125

4 5 Which processes are functions of the liver? absorbing food assimilating food helping with digestion of food A 33 3 B 33 × key C 3 × 3 3 = is a function D × 33 × = is not a function 6 The diagram shows the digestive system of a rabbit. In which structure is lipase produced? 7 On a sunny day, how does water vapour move through the stomata of a leaf? A into the leaf by diffusion B into the leaf by respiration C out of the leaf by diffusion D out of the leaf by respiration A B C D diaphragm www.KiasuExamPaper.com 126

5 [Turn over 8 A plant was placed in a bell-jar in a brightly lit area. The air in the bell-jar contains carbon dioxide that has been radioactively labelled. After an hour, a cross-section of the plant’s stem was placed on photogenic film which turns black when exposed to radioactivity. Which diagram shows the area where the film becomes black? A B C D 9 The graph below shows the effect of light intensity on the rate of photosynthesis. What is the factor that is limiting the rate of photosynthesis at points X and Y? XY A carbon dioxide concentration light intensity B light intensity carbon dioxide concentration C temperature carbon dioxide concentration D temperature light intensity rate of photosynthesis high carbon dioxide concentration medium carbon dioxide concentration low carbon dioxide concentration light intensity X Y www.KiasuExamPaper.com 127

6 10 The following statements are the characteristics of blood transported by a blood vessel in the human body. x High concentration of oxygen x Low concentration of carbon dioxide x Low blood pressure What is this blood vessel? A aorta B vena cava C pulmonary vein D pulmonary artery 11 After finishing a race, an athlete still continues to breathe m ore quickly and deeply than normal for several minutes. Which statement correctly explains this observation? A to remove carbon dioxide produced during anaerobic respiration B to remove urea produced from the breakdown of amino acids C to take in extra oxygen to break down lactic acid D to replace stored glycogen in muscles www.KiasuExamPaper.com 128

7 [Turn over 12 The diagram shows the main components involved in coordination and response towards stimulus. What are represented by X and Y? XY A effector receptor B receptor effector C brain spinal cord D spinal cord brain 13 The graph shows the changes in the size of the pupil of the eye as the light intensity of the surroundings is changed. Which time period shows the light intensity increasing? A 5 to 10 seconds B 10 to 15 seconds C 25 to 35 seconds D 35 to 40 seconds integrating centre Y responsestimulus X 0 5 10 15 20 25 30 35 40 45 50 time / seconds diameter of pupil / mm 12 10 8 6 4 2 0 www.KiasuExamPaper.com 129

8 14 Four people had the following descriptions with regards to their body and dietary conditions. x Normal, has not eaten for 24h x Normal, before lunch x Normal, 3h after lunch x Diabetic, 3h after lunch They were then tested for their blood glucose levels. The graph shows the blood glucose levels of the 4 people. Which row correctl y describes the graph? 1 2 3 4 A normal; before lunch normal; 3 hours after lunch normal; has not eaten for 24 hours diabetic; 3 hours after lunch B normal; before lunch diabetic; 3 hours after lunch normal; has not eaten for 24 hours normal; 3 hours after lunch C normal; has not eaten for 24 hours diabetic; 3 hours after lunch normal; before lunch normal; 3 hours after lunch D normal; 3 hours after lunch diabetic; 3 hours after lunch normal; has not eaten for 24 hours normal; before lunch blood glucose level (mg/dL) 1 2 3 4 www.KiasuExamPaper.com 130

9 [Turn over 15 The diagram shows the female reproductive system. What is the function of the part labelled X? A gamete production and hormone secretion B gamete production only C hormone secretion only D zygote production and hormone secretion 16 What would be the result of cutting the tubes marked X? A Male sex hormones could not reach blood. B The flow of urine would be prevented. C The production of sperm would stop. D The sperm could not be transported out of the urethra. X XX www.KiasuExamPaper.com 131

10 17 A gene of a particular organism contains 29% thymine (T). Which row would best represent the percentage distribution of the other nucleotides in this gene? adenine (A) cytosine (C) guanine (G) A 21 % 29 % 21 % B 21 % 21 % 29 % C 29 % 21 % 21 % D 29 % 21 % 29 % 18 The diagram shows a food web in a woodland. In this food web, a lizard is _________________. A a carnivore B a decomposer C a herbivore D a producer www.KiasuExamPaper.com 132