BPGHS 2018 Bio Prelim P2 QP

Name of Candidate: _____________________ ( ) Class: _________ Calculator Model: This paper consists of 17 printed pages. BUKIT PANJANG GOVERNMENT HIGH SCHOOL Preliminary Examination 2018 SECONDARY 4 Express BIOLOGY Paper 2 6093/02 Date: 13 August, 2018 Duration: 1hr 45 min Time: 1115 – 1300 hr READ THESE INSTRUCTIONS FIRST Write your name, class and register number on all the work you hand in. Write in dark blue or black pen. You may use a pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. Section A [50 marks] Answer all questions. Write your answers in the spaces provided on the Question Paper. Section B [30 marks] Answer all questions. Write your answers in the spaces provided on the Question Paper. Electronic calculators may be used. You are advised to spend no longer than one hour on Section A and no longer than 45 minutes on Section B. The total number of marks is given in brackets [ ] at the end of each question or part question. [Turn over For Examiner’s Use Section A / 50 Section B / 30 Total / 80 www.KiasuExamPaper.com 76

2 ©BPGHS 2018 6093 / SEC 4 EXP BIO PRELIM / P2 / 18 [Turn over Section A Answer all questions. Write your answers in the spaces provided. 1 Fig. 1.1(a) shows a flower very shortly after it has opened and Fig. 1.1(b) shows the same flower several days later. Fig. 1.1(a) Fig. 1.1(b) (a) On Fig. 1.1(b), label a filament and a sepal. [2] (b) State two features of the flower in Fig. 1.1(a) that could have attracted the insect. 1. ………..………………………………………………………………………………............... 2. …..………………………………………………………………………………………….. [2] Using information from Fig. 1.1(a) and Fig. 1.1(b), (c)(i) explain why flowers of this plant rarely self-pollinate, and ….…………………………………………………………………………………………………… …………...………………………………………………………………………………………….. ….…………………..……………………………………………………………………………….. …..………………………….…………………………………………………………………….[2] www.KiasuExamPaper.com 77

3 ©BPGHS 2018 6093 / SEC 4 EXP BIO PRELIM / P2 / 18 [Turn over (ii) suggest how the insect brings about pollination in this species of plant. ….…………………………………………………………………………………………………… ….…………………………………………………………………………………………………… ….…………………………………………………………………………………………………… ….…………………………………………………………………………………………………… ….…………………………………………………………………………………………………… …..…………………………………………………………………………………………….… [3] [Total:9] www.KiasuExamPaper.com 78

4 ©BPGHS 2018 6093 / SEC 4 EXP BIO PRELIM / P2 / 18 [Turn over 2 Fig. 2.1 shows the blood groups of the members of two families. Fig. 2.1 The alleles responsible for blood groups are IA, IB and IO. (a) State the term used to describe the relationship between alleles IA and IB. ……………………………………… [1] (b) Identify, by number, which one of the children had been adopted by their family and could not be the genetic offspring of the parents. Explain your answer. child number ………………………….. explanation ……………………………………………………………………………………. ………………………………………………………………………………………………….. ………………………………………………………………………………………………..[2] (c) When children 4 and 5 grow up, they have a child of their own, child 8, as shown in Fig. 2.1. Using a genetic diagram, explain the possible genotypes and phenotypes of child 8. [2] [Total:5] www.KiasuExamPaper.com 79

5 ©BPGHS 2018 6093 / SEC 4 EXP BIO PRELIM / P2 / 18 [Turn over 3 Fig. 3.1 shows the percentage of plants surviving over many thousands of years. During that time, the environment was becoming drier. Fig. 3.1 (a) Suggest why the number of grass plants is declining more rapidly than the trees at time E. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ……………………………………………………………………………………………………[2] (b) Explain why the variety of types of herbivore was greatest at time D. ………………………………………………………………………………………………………. …………………………………………………………………………………………………….[1] www.KiasuExamPaper.com 80

6 ©BPGHS 2018 6093 / SEC 4 EXP BIO PRELIM / P2 / 18 [Turn over Fig. 3.2 shows the lengths of the necks of a particular species of herbivore at times E and F. Fig. 3.2 (c) Describe what the graph shows about the herbivores at time F as compared with those at time E. ……………………………………………………………………………………………………… …………………………………………………………………………………………………….[1] (d) Suggest an explanation for the change in neck length of the herbivore between times E and F. ……………………………………………………………………………………………………… …………………………………………………………………………………………………….[1] [Total:5] www.KiasuExamPaper.com 81

7 ©BPGHS 2018 6093 / SEC 4 EXP BIO PRELIM / P2 / 18 [Turn over 4 Fig. 4.1 shows a student breathing. Fig. 4.1 (a) State three ways in which the air in the jar will differ from atmospheric air. 1. ………………………………………………………………………………………………….. 2. ………………………………………………………………………………………………….. 3. ………………………………………………………………………………………………..[3] (b) Describe what occurs in the student’s thorax to cause air to be breathed out into the jar. ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… …………………………………………………………………………………………………... [4] (c) By referring to the cells in the student’s body, suggest how the differences you mentioned in (a) are brought about. ……………………………………………………………………………………………………… ……………………………………………………………………………………………………… ……………………………………………………………………………………………………[2] [Total:9] www.KiasuExamPaper.com 82

8 ©BPGHS 2018 6093 / SEC 4 EXP BIO PRELIM / P2 / 18 [Turn over 5( a ) The equations below show two chemical reactions involving different types of sugar. Reaction 1: glucose + M Æ sucrose + water Reaction 2: lactose + water Æ N + glucose (i) Identify substances M and N. M: …………………………………………………………………………………………………… N: …………………………………………………………………………………………………[2] (ii) Name the type of reaction in Reaction 1 and explain the process. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. …………………………………………………………………………………………………….[2] (b) Fig. 5.1 shows an experiment investigating the uptake of glucose by the villi. Two leak-proof bags, P and Q, were set up. P was made from an artificially partially permeable membrane (Visking tubing). Q was made from a piece of small intestine containing living cells, with its inner surface inside the bag. Both P and Q were filled with equal volumes of the same dilute glucose solution. P and Q were then suspended in a glucose solution of the same concentration for two hours. In the first hour, the glucose concentration in Q decreased. By the second hour, the glucose concentration in Q decreased further. The volume of water in Q also decreased after two hours. There were no changes to the volume and concentration of the glucose solution in P. Fig. 5.1 www.KiasuExamPaper.com 83

9 ©BPGHS 2018 6093 / SEC 4 EXP BIO PRELIM / P2 / 18 [Turn over (i) State and explain the process responsible for the decrease of glucose concentration in Q in the first hour. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. …………………………………………………………………………………………………….[2] (ii) Explain why the glucose concentration in Q decreased further in the second hour. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. …………………………………………………………………………………………………….[2] (iii) Explain why the volume of water in Q decreased after two hours, but the volume of water in P remained the same. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. ………………………………………………………………………………………………………. …………………………………………………………………………………………………….[2] [Total: 10] www.KiasuExamPaper.