NYGH 2011-S3EOY-Bio P2

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2011 Secondary Three BIOLOGY 1 hour 45 minutes Paper 2 Theory Paper 0915 – 1100 hr Friday 14 October 2011 Additional materials: Writing papers and graph paper 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 and on any separate answer paper used. Section A (40 marks) Answer all questions. Write your answers in the spaces provided on the question paper. Section B (30 marks) Answer all questions including questions 5, 6 and 7 Either or 7 Or. Write your answers on the separate writing paper provided. At the end of the examination, 1. fasten all your work securely together; 2. tick 7 Either or 7 Or next to the number 7 in the grid below to indicate which question you have answered. INFORMATION FOR CANDIDATES Examiner’s Use Section A Section B 5 6 7 Either 7 Or Total The intended number of marks is given in the brackets [ ] at the end of each question or part question. You are advised to spend no longer than one hour on Section A and no longer than 45 minutes on Section B. CL, ST, WLF This document consists of 12 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over

2011 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School Section A Answer all questions. Write your answers in the spaces provided. 1 Fig. 1.1 shows the cross section of a dicotyledonous stem. (Flickr photo by Shihchuan 2010. Available for download under a Creative Commons license http://www.flickr.com/photos/epingchris/5110418885/in/photostream/) Fig. 1.1 (a) (i) Identify structures X and Y in Fig. 1.1 [1] X: Y: (ii) List two substances that are found in structure X. [1] (b) The functions of 3 different regions R1, R2 and R3 are described below. [3] R1 Storage region R2 Region of active cell division and differentiation R3 Protective region Identify R1, R2 and R3 and label them on Fig. 1.1. X Y CL, ST, WLF Biology /II

2011 End- of-Year Examination Secondary Three 3 Nanyang Girls’ High School ) (i) Draw and label longitudinal sections of structures X and Y. [2] 1 (c Structure X Structure Y (ii) ded to use structure Y to replace the hepatic vein in important modification that must be incorporated and xplain why. [1] Scientists had deci the human body. Suggest one e (d) (i) ucted in order to roduce a drawing of a typical dicotyledonous stem. [1] Suggest how sampling of specimens can be cond p (ii) can be collected with the elp of aphids. Controls must be included. [1] Suggest how substances from structure X h [Total: 10] CL, ST, WLF Biology/II [Turn over

2011 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School (a) Fig. 2.1 shows the structure of a short chain of amino acids. 2 Fig. 2.1 (i) ompletely to show the total number of amino cids in this short chain. [1] i) hat is the type of bond formed between two amino acids? Circle each amino acid c a (i W [1] (b) ig. 2.2 shows the structure of a polysaccharide. F Source: http://www.bio.miami.edu/dana/226/226F08_2print.html Fig. 2.2 CL, ST, WLF Biology /II

2011 End- of-Year Examination Secondary Three 5 Nanyang Girls’ High School 2 (b) ons why this olysaccharide can be suitable as storage compound in cells. [3] Based only on what can be seen in Fig. 2.2, suggest three reas p (c) Fig. 2.3 shows the structure of another polysaccharide. Source: http://www.bio.miami.edu/dana/226/226F08_2print.html Fig. 2.3 ason, whether it is possible or impossible to identify this olysaccharide. [1] Suggest with re p CL, ST, WLF Biology/II [Turn over

2011 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School ) ig. 2.4 shows the structure of a fat molecule. 2 (d F Source: http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/F/Fats.html Fig. 2.4 (i) n one of the fatty acid chains is replaced by a hosphate group? [1] What is formed whe p (ii) uggest a change to the physical property when (d)(i) occurs. Explain. [3] S [Total: 10] CL, ST, WLF Biology /II

2011 End- of-Year Examination Secondary Three 7 Nanyang Girls’ High School 3 (a) Compare and contrast diffusion with osmosis. [2] (b) Fig. 3.1 shows an amoeba capturing a ciliate. (Flickr photo by Marc Perkins 2011. Available for download under a Creative Commons license http://www.flickr.com/photos/occbio/5619021445/in/set-72157626372633771/) Fig. 3.1 (i) Explain how the amoeba is able to capture the ciliate. [2] (ii) Bread moulds do not capture food but release enzymes to digest the food outside the body of the bread mould. Descr ibe the process that makes this possible. [1] ciliate Amoeba CL, ST, WLF Biology/II [Turn over

2011 End-of-Year Examination Secondary Three 8 Nanyang Girls’ High School 3 (c) Fig. 3.2 shows one possible way that glucose molecules can be transported across the cell membrane. Source:http://www.ncbi.nlm.nih.gov/books/NBK9847/figure/A1991/?report=objectonly Fig. 3.2 (i) State the process which allows gluc ose molecules to move across the cell membrane. Give two reasons, based solely on information from Fig 3.2, to support your answer. [3] (ii) Using only information from Fig 3.2 , suggest one possible way to increase the rate of glucose uptak e by the cell and explain how it works. [2] [Total: 10] CL, ST, WLF Biology /II

2011 End- of-Year Examination Secondary Three 9 Nanyang Girls’ High School 4 Fig. 4.1 shows the external features of a mammalian heart. Fig. 4.1 (a) Identify structure Q. [1] Q: (b) Using arrows on Fig. 4.1, show the flow of oxygenated and deoxygenated blood through the vessels transporting blood between the heart and lungs. You may wish to use ‘solid’ and ‘dashed’ lines to distinguish oxygenated and deoxygenated blood flow. [2 ] (c) Fig. 4.2 is a micrograph of a transverse section through structure Q. Source: http://blog.lib.umn.edu/trite001/studyinghumananatomyandphysiology/2008/02/ artery_vein_capillary_which_on.html Fig. 4.2 R S Q CL, ST, WLF Biology/II [Turn over

2011 End-of-Year Examination Secondary Three 10 Nanyang Girls’ High School (i) Name the tissues R and S. [1] R: S: (ii) State two ways in which a transverse section of a vein would be different. [2] . 1. 2. (iii) Suggest why tissue R is folded. [1] (d) Discuss possible links between diet and a named heart disease associated with structure Q. [3]