Broadrick_2019_Bio_Prelim_P1_QP

This question paper consists of 20 printed pages including this page. [Turn over Name Class Index Number BROADRICK SECONDARY SCHOOL SECONDARY 4 EXPRESS PRELIMINARY EXAMINATION 2019 BIOLOGY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet 6093/01 Sep 2019 1 hour READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples, paper clips, glue or correction fluid Write your name, index number and class on the OTAS answer sheet. There are forty 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 record your choice in soft pencil on the separate OTAS answer 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 144

2 6093/1/9/19 1. Which of the following is found in all living cells? A centrioles and nucleus B chloroplast and protoplasm C golgi apparatus and cell membrane D vacuole and cell wall 2. The diagram below shows a general animal cell. Which of the structures would be involved in the final secretion of digestive enzymes from this cell? 3. A few leaves of purple cabbage were placed in a beaker of water for 10 minutes. The water remained colourless after the 10 minutes. The beaker was then heated to 100°C for 5 minutes. After boiling , the water turned purple. Which of the following best explains this observation? A The pigments gained more kinetic energy upon heating and were able to diffuse out of the leaves quickly, hence the coloured water in just 5 minutes. B The cell walls were denatured upon heating, allowing the pigment to diffuse into the water. C During the boiling, the cell membranes were damaged, hence allowing the pigment to diffuse into the water. D Heating increases the solubility of the pigment, thus colouring the water purple. A B C D www.KiasuExamPaper.com 145

3 6093/1/19 [Turn over 4. Which of these processes require energy from respiration? Diffusion Osmosis A 99 B 9 8 C 89 D 88 5. An experiment was carried out to investigate the digestion of starch using amylase at two different temperatures, 100C and 400C. A sample is taken every 15 seconds and placed into each well as shown below. Each well contains 2 drops of iodine solution and 15 samples were taken from each temperature condition. The results are shown below. Which of the following shows the correct temperatures and times for the complete digestion of starch? Temperature / 0Ct ime/s A 10 60 40 210 B 10 210 40 60 C 40 45 10 195 D 40 195 10 45 Key: blue-black yellow- brown www.KiasuExamPaper.com 146

4 6093/1/9/19 6. The graph shows changing energy levels during a reaction, with and without the presence of the enzyme specific to this reaction. What