Sec 4 Science Biology SA2 2018 Kranji QP

10 21 The diagram below shows five different types of cells. 1 2 3 4 5 Which row identifies the functions of the cells shown? transmits nerve impulses manufacture sugar carry genetic information conducts water and mineral salts transports oxygen A 5 3 2 4 1 B 2 3 5 1 4 C 3 4 2 5 1 D 2 4 5 3 1 22 A type of mammalian red blood cell is found to contain cytoplas m that is isotonic to 1% salt solution. If these red blood cells were immersed in 0.5% salt solution they would A gain water by active transport and burst. B gain water by osmosis and burst. C lose water by active transport and shrink. D lose water by osmosis and shrink. 23 According to the lock and key hypothesis, which is the lock and k e y f o r f a t digestion? key lock A fatty acids glycerol B lipase lipids C lipase glycerol D lipids lipase 2018 Sec 4 Science Biology SA2 - Kranji www.KiasuExamPaper.com 199

11 24 Which of the lines represents the activity of amylase in starch digestion? 25 What would happen if a person’s bile duct became blocked? A Carbohydrate digestion would stop. B Fat digestion would be reduced. C Fat digestion would stop. D Manufacture of bile would stop. 26 The graph shows the effect of changing light intensity on the a mount of carbon dioxide (CO2) absorbed or released by green plants. Which of the following statements is/are not true? I The photosynthetic rate is greater than the respiratory rate between X and Y. II The respiratory rate is greater than the photosynthetic rate between Y and Z. III There is no respiration occurring at Z. A I only B III only C I and II only D I, II and III 1 2 3 4 5 6 7 8 light intensity/ AU Z Y X rate of CO2 exchange/ arbitrary units net CO2 uptake net CO2 removal starch concentration mouth oesophagus stomach duodenum location along alimentary canal A B C D www.KiasuExamPaper.com 200

12 27 The diagram shows sections from the stem of a plant which had b een standing in coloured solution for one day. Which tissues would be most heavily stained? A Q only B R only C P and Q D Pa n d R 28 Translocation occurs in the phloem and aphids feed on the conten ts of phloem tubes. What type of food would be lacking in their diet? A amino acid. B glucose. C lipids. D sucrose. P Q R www.KiasuExamPaper.com 201

13 29 The diagram shows a congenital defect in which the median septu m of the heart fails to fully form resulting in a “hole in the heart”. Which of the following would not be a likely consequence of the disease? A There would be a reduction in the pressure of blood entering the lungs. B There would be a reduction in the amount of oxygen brought to body cells. C The heart will become weaker and contract less. D There would be a reduction in the pressure of blood leaving thr ough the aorta. 30 The figure shows a setup to investigate respiration. Three live cockroaches are placed in set-up U and set-up V. R is a solution which absorbs oxygen. What results would you expect to observe after 24 hours? A The cockroaches in setup U will die. B The cockroaches in setup V will die. C The cockroaches in both setups will die. D The cockroaches in both setups will live. median septum set-up U set-up V R water www.KiasuExamPaper.com 202

14 For questions 31 and 32, refer to the graph below. The graph shows the thickness of the lens of a woman as she looked at the movement of a mosquito. 31 During which period was she looking at a mosquito biting her hand? 32 During which period was she looking at the mosquito flying away from her? 33 The following investigation was carried out using flower buds g rowing on three plants of the same species. Plant X – The anthers were carefully removed and the buds left open to the air. Plant Y – The anthers were left untouched and a paper bag was tied tightl y around each bud. Plant Z – The anthers were carefully removed and a paper bag was tied tigh tly around each bud. Although all flowers later opened normally, only those in Plant X produced seeds. This result shows that in this species, A only cross-pollination can be successful. B only wind-pollination can be successful. C only insect-pollination can be successful. D both self-pollination and cross-pollination can be successful. thickness of lens A B C D time/s www.KiasuExamPaper.com 203

15 34 The diagram shows the structure of a flower. The functions of the four labelled parts are: 1 attracts insects 2d e v e l o p s i n t o a f r u i t 3 produces pollen 4 receives pollen Which of the following rows is correct? W X Y Z A 3 4 1 2 B 3 4 2 1 C 4 3 1 2 D 4 3 2 1 35 The following events occur after fertilization in humans. P: A zygote is formed in the fallopian tube. Q: Cell division occurs to form a ball of cells. R: The embryo implants into the uterine lining. S: The ball of cells travels down the fallopian tube. Which is the correct order of events after fertilization in humans? A P Æ Q Æ S Æ R B Q Æ S Æ R Æ P C Q Æ R Æ P Æ S D R Æ P Æ Q Æ S W X Y Z www.KiasuExamPaper.com 204

16 36 The diagram shows a side-view of the reproductive system of a woman. Where does maturation of the ova occur? 37 The diagram shows part of a strand of deoxyribonucleic acid. Which part represents a nitrogenous base? 38 How does continuous variation differ from discontinuous variation? continuous variation has two or more distinct types of traits continuous variation is controlled by A no few genes B no many genes C yes few genes D yes many genes D A B C A B C D www.KiasuExamPaper.com 205

17 -E n d o f P a p e r - 39 This shows the food web of an urban park habitat. Which is a tertiary consumer? A centipede B slug C spider D toad 40 The diagram shows a simplified sewage treatment system. Which of the following explains why air is continuously pumped into the sewage in the aeration tank? A to increase the oxygen content of treated sewage before discharge B to kill aerobic bacteria C to provide enough oxygen for bacteria to decompose sewage D to remove harmful gases such as hydrogen sulphide raw sewage settling tank Sedimentation tank aeration tank treated sewage (clear fluid) large solids sludge dead leavesslug lizard millipede termite toad spider centipede scorpion www.KiasuExamPaper.com 206

1 Name: __________________________ ( ) Class: __________ Centre Number: _______ Index Number: ________ KRANJI SECONDARY SCHOOL Preliminary Examination Secondary 4 Express/ 5 Normal (Academic) SCIENCE (BIOLOGY) 5078/4 PAPER 4 Tuesday 14 Aug 2018 1 hour 15 minutes KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI SECONDARY KRANJI READ THESE INSTRUCTIONS FIRST Write your Centre number, index number and name on all the work you hand in. INSTRUCTIONS TO CANDIDATES Do not open this booklet until you are told to do so. Write your name, class and register number in the spaces provided on the cover page. Section A Answer all questions. Write your answers in the spaces provided on the question paper. Section B Answer anytwo questions. Write your answers in the spaces provided on the question paper. INFORMATION FOR CANDIDATES The number of marks is given in brackets [ ] at the end of eac h question or part question. ________________________________________________________________________________ This question paper consists of 17 printed pages (including cover page).