Sec 4 Science Biology SA2 2018 Woodlands QP

Name: _____________________________ ( ) Class: ________ WOODLANDS SECONDARY SCHOOL PRELIMINARY EXAMINATION 2018 Level: Sec 4 Express & Sec 5 Normal Academic Marks: 40 marks Subject: 5078 Science (Chemistry/Biology) Day: Tuesday Paper: 1 Date: 28 th Aug 2018 Duration: 1 hour Time: 1230 1330 READ THESE INSTRUCTIONS FIRST Write your name, index number and class on the question paper. Write in dark blue or black pen. You may use a soft pencil for any diagrams, graphs, tables or rough working. The use of a calculator is expected, where appropriate. Do not use staples, paper clips, highlighters, glue or correction fluid. Section A There are twenty questions. 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 optical answer sheet provided. Hand in both multiple choice answer sheet and question paper separately. DO NOT TURN THE PAGE UNTIL YOU ARE TOLD TO DO SO. This document consists of 9 printed pages and1 blank page only. FOR EXAMINER’S USE Section A /20 Total /20 www.KiasuExamPaper.com 312

2 2 Section A: Multiple Choice Questions (20 marks) Answer all questions. Shade your answers in the multiple choice answer sheet provided. 1 The electron micrograph below shows part of a plant cell. Which cell structure is responsible for the production of a new cell? 2 Which set of conditions will result in the following observations in the dialysis tube? BEFORE after solution A solution B A 0.5 % sucrose solution 2 % sucrose solution B 2 % sucrose solution water C 10 % sucrose solution 0.5 % sucrose solution D 20 % sucrose solution 10 % sucrose solution A D C B afafafafafafafafafafafafafafafafafafafteteteteteteteteteteteteteteteteteteterrrrrrrrrrrrrrrrrrr AFTER solution A solution B solution A solution B www.KiasuExamPaper.com 313

3 3 3 The diagram shows four types of cells, not drawn to scale. Which cell does not contain cytoplasm? 4 The diagram represents the activity of an enzyme. What are the labelled structures? ‘lock’ ‘key’ product substrate A 1224 B 2132 C 4321 D 1242 5 Milk produces a brick red precipitate when heated with Benedict’s solution. It develops a purple colour when biuret test is conducted. Using these results only, what can we conclude about the nutrients present in milk? A proteins present, reducing sugars absent B reducing sugars and proteins present C reducing sugars and starch present D starch and proteins present www.KiasuExamPaper.com 314

4 4 6 The diagram below shows part of a transverse section of a leaf. Which cells have the ability to convert light energy to chemical energy? A 1, 2 and 3 only B 2 and 3 only C 2, 3 and 4 only D 3 and 4 only 7 The diagram below shows a cross-section through a stem. Which option identifies tissue X and describes the process occurring in it? tissue X process A phloem translocation B phloem transpiration C xylem translocation D xylem transpiration X www.KiasuExamPaper.com 315

5 5 8 The diagram represents part of the human circulatory system, with some blood vessels identified by letters. Which comparison of carbon dioxide concentration is correct? higher carbon dioxide concentration lower carbon dioxide concentr ation A VY B WX C XV D XZ 9 The diagram shows part of the lining of the human trachea. What is the function of cell X? A gaseous exchange B moisten the air C mucus removal D secretion of mucus www.KiasuExamPaper.com 316

6 6 10 Some substances secreted by the pancreas are listed below. 1 amylase 2 glucagon 3 insulin 4 lipase Which substances are released from the endocrine cells in the islets of Langerhans of the pancreas? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4 11 The diagrams show two sections through the eye of the same person viewing different things. What happens to achieve the changes from the eye in diagram 1 to the eye in diagram 2? ciliary muscles iris radial muscles A contract relax B contract contract C relax relax D relax contract www.KiasuExamPaper.com 317

7 7 12 The diagram shows a section through a flower that has been pollinated. What passes through tube X? A female gamete B male gamete C pollen grain D seed 13 The diagram below shows the production of a zygote. Which option correctly describes the zygote? multicellular genetically similar as parent X contains same number of chromosomes as parent Y A no yes no B no no yes C yes yes no D yes no yes parent X parent Y www.KiasuExamPaper.com 318

8 8 14 Which statement about DNA is correct? A A molecule of DNA contains many genes. B A molecule of DNA is larger than a chromosome. C A molecule of DNA refers to a single allele. D Each molecule of DNA will contain a single type of base. 15 Plant B is produced from plant A in the following manner as shown in the diagram below. Which of the following is not true of plant B? A It has one parent. B It is produced by asexual reproduction. C It is produced by self-fertilisation. D It will have the same genetic make-up as plant A. 16 A gene contains 15% of guanine bases. How many percent of thymine bases does the gene contain? A 5 % B 15 % C 35 % D 70 % Plant A Plant B cut rooting hormone www.KiasuExamPaper.com 319

9 9 17 A farmer sprays insecticide on his crops for a year. The insecticide washes off into a nearby lake where it is absorbed by the producer to enter the food chain (as shown below). The insecticide is unable to be excreted by the organisms. Which option shows the likely levels of insecticide in these organisms at the end of the year? Insecticide found in organism / ppm (parts per million) green plants crabs small fish birds A 0.05 0.05 0.05 0.05 B 0.05 0.5 0.05 0.05 C 0.05 0.5 5 25.0 D 25.0 5.0 0.5 0.05 18 The fertilisation of which pair of sperm and egg will result in a child with Down’s syndrome? chromosomes in egg chromosomes in sperm A 23 23 B 24 24 C 24 23 D 46 47 19 Some processes are listed below. 1 absorption of carbon dioxide by oceans 2 feeding activity of carnivores 3 respiration by animals and plants 4 photosynthesis by land plants Which processes act as carbon sinks? A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4 20 The events of the menstrual cycle are dependent on the hormonal changes occurring in the female body. Which option correctly shows the hormonal changes during ovulation and menstruation? ovulation menstruation A increase in oestrogen decrease in progesterone B increase in oestrogen increase in progesterone C peak in oestrogen decrease in progesterone D peak in oestrogen increase in progesterone green plants crabs small fish birds www.KiasuExamPaper.com 320

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