NYGH 2017-S3EOY-IP Bio P1

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2017 Secondary Three BIOLOGY Paper 1 Multiple Choice 45 minutes Monday 2 October 2017 0845 - 0930 Additional materials: Multiple Choice Answer Sheet READ THESE INSTRUCTIONS FIRST Do not open this booklet until you are told to do so. Write your name, register number and class in the spaces at the top of this page. There are thirty questions in 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 shade your choice in pencil on the separate Multiple Choice Answer Sheet provided. 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. Setter: OChee & LSM This document consists of 13 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over

2017 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School IP Biology / I 1 Which of the following substances is the main constituent in protoplasm? A dissolved nutrients B dissolved waste substances C mineral salts D water 2 Hibernating animals in cold climates are kept warm by the action of brown fat cells. Which organelle will be most abundant in these cells? A chloroplast B Golgi apparatus C ribosome D vacuole 3 The diagram shows an experiment using an uncooked potato. The skin of the potato was removed as shown. Which diagram shows the result of the experiment after 24 hours? concentrated sugar solution potato water skin has been removed A B C D

2017 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School IP Biology / I [Turn over 4 The diagram shows a synapse, which is a junction between two nerve cells. In order for the nerve cells to communicate, a chemical called a neurotransmitter is used. The arrows show how the neurotransmitter is passed from the first nerve cell to the second nerve cell. Which process is shown by arrows 1, 2 and 3? A active transport B endocytosis C exocytosis D osmosis For questions 5 and 6, refer to the following table of observations of food tests on four different substances. substance observations biuret test Benedict’s test ethanol-emulsion test iodine test A violet brick red with ppt colourless blue-black B blue green with ppt white emulsion brown C violet yellow with ppt white emulsion blue-black D blue blue colourless brown 5 Which substance is likely to contain only two nutrients? 6 Which substance would provide a marathon runner with a quick source of energy during her race? first nerve cell second nerve cell neurotransmitter 1 2 3

2017 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School IP Biology / I 7 The diagram shows the digestion of a large molecule to its basic units. Which row correctly identifies Q and R? Q R A amylase maltase B amylose maltose C pepsin trypsin D pepsinogen trypsinogen For Questions 8 and 9 refer to the enzyme phenylalanine hydroxylase (PAH). The enzyme catalyses the addition of a hydroxyl group to phenylalanine to form tyrosine. 8 Phenylketonuria (PKU) is a disease where a person has a defective form of the enzyme PAH. The diagrams represent some substrates and enzymes. Which row correctly identifies phenylalanine, the hydroxyl group, PAH and the defective PAH? phenylalanine hydroxyl group PAH defective PAH A W Y X Z B X Y W Z C Y X Z W D Z X Y W Q R

2017 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School IP Biology / I [Turn over 10 What is the role of light energy in photosynthesis? A to maintain an optimum temperature for photosynthetic enzymes to work B to split carbon dioxide molecules into carbon and oxygen C to split water molecules into protons and oxygen D to synthesise proteins from amino acids 9 Which graph shows how phenylalanine hydroxylase (PAH) is affected by temperature? A C B D rate of reaction 37 temperature / oC rate of reaction 60 temperature / oC rate of reaction 37 temperature / oC rate of reaction 60 temperature / oC

2017 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School IP Biology / I 11 During the day, a plant gives out oxygen and takes in carbon dioxide. How can this phenomenon be explained in terms of respiration and photosynthesis? A The plant is photosynthesising but not respiring. B The plant is photosynthesising faster than it is respiring. C The plant is respiring but not photosynthesising. D The plant is respiring faster than it is photosynthesising. For questions 12 and 13, refer to the diagram which shows an experimental set-up used to study the rate of photosynthesis. 12 Why does the meniscus of the water in the syringe move downwards after the artificial light source is switched on? A As the plant respires, the carbon dioxide produced pushes the water down. B Capillary action occurs, causing the meniscus to move down. C Oxygen produced by the plant displaces the water. D The water is pulled downwards by gravity. 13 A student decides to replace the water with dilute sodium bicarbonate solution. What is the likely observation? A The meniscus moves downwards at a faster rate. B The meniscus moves downwards at a slower rate. C The meniscus moves upwards at a faster rate. D The meniscus moves upwards at a slower rate. water metre rule meniscus light from artificial source

2017 End-of-Year Examination Secondary Three 7 Nanyang Girls’ High School IP Biology / I [Turn over 14 The graph shows how the rate of photosynthesis varies with light intensity at two different temperatures. All other variables are kept the same. In which sections of the graph is light intensity limiting the rate of photosynthesis? A P and R B Q and S C R and Q D S and P 15 The diagram shows an experiment in which discs of equal area are removed from the same leaf of a destarched plant. The plant had been treated as shown and the dry weight of the leaf discs was measured in grams (g). Which row is correct? value of (y - x) g represents value of (y - z) g/ 6h represents the rate of A food produced by photosynthesis respiration B water lost in transpiration transpiration C food used in respiration photosynthesis D water gained during photosynthesis translocation rate of photosynthesis / arbitrary units light intensity / arbitrary units S Q P R 25oC 15oC leaf disc removed at 10 am (x g) exposed to light at 4 pm, the leaf is destarched and placed in darkness leaf disc removed at 4 pm (y g) leaf disc removed at 10 pm (z g)

2017 End-of-Year Examination Secondary Three 8 Nanyang Girls’ High School IP Biology / I 16 Polar molecules form hydrogen bonds with each other. Which properties of water result from its molecules being polar? 1 able to adhere to xylem wall 2 cohesiveness 3 does not pass through phospholipid bilayer easily 4 low molecular mass A 1, 2 and 3 B 1, 2 and 4 C 1, 3 and 4 D 2, 3 and 4 17 The photomicrograph shows a part of a longitudinal section of a plant stem. What substances do structures 1 and 2 transport? structure 1 structure 2 A amino acids water B sucrose mineral ions C mineral ions sucrose D water mineral ions 1 2

2017 End-of-Year Examination Secondary Three 9 Nanyang Girls’ High School IP Biology / I [Turn over 18 The leaves of a plant were exposed to radioactive carbon dioxide in the presence of light. After several hours, a cross-sectional slice of the root was made and exposed to an X-ray film. The outline of the cross-s