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 cockroache