NYGH 2019-S3EOY-IP Bio P2B

Class Register Number Name 南洋女子中学校 NANYANG GIRLS’ HIGH SCHOOL End-of-Year Examination 2019 Secondary Three IP BIOLOGY Paper 2 Theory Paper 1 hour 45 minutes Friday 11 October 2019 1000 – 1145 Additional materials: Nil READ THESE INSTRUCTIONS FIRST Do not open this document until you are told to do so. Write your name, register number and class in the spaces at the top of this page. Section B Answer three questions. Question 10 is in the form of an Either/Or question. Only one part should be answered. Write your answers in the spaces provided on the question paper. At the end of the examination, 1. fasten all your work securely together; 2. tick 10 Either or 10 Or in the grid-box to indicate the question answered. You are advised to spend no longer than 1 hour on Section A, and no longer than 45 minutes on Section B. The intended number of marks is given in the brackets [ ] at the end of each question or part question. The use of an approved scientific calculator is expected, where appropriate. Setter: OC, TZZ This document consists of 12 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over B

2019 End-of-Year Examination Secondary Three IP 2 Nanyang Girls’ High School IP Biology Section B Answer three questions. Question 10 is in the form of an Either/Or question. Only one part should be answered. Write your answers in the spaces provided on the question paper. 8 (a) Describe the structure of DNA. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. ………………………………………………………………………………………….. [4] (b) (i) Using the “lock and key” hypothesis, explain the digestion of starch by amylase. .……………………………………………………………………………….. ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… [3]

2019 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School IP Biology [Turn over (ii) While doing spring cleaning in a laboratory, a student found a glass bottle labelled as amylase in the refrigerator. Briefly describe an experiment he can carry out to confirm that bottle contained the enzyme, amylase. ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… ………………………………………………………………………………… [3] [total: 10]

2019 End-of-Year Examination Secondary Three IP 4 Nanyang Girls’ High School IP Biology 9 Fig. 9.1 shows the plant, Potamogeton natans in its habitat. Fig. 9.2 shows a photomicrograph of a section through the leaf of the plant. https://www.first-nature.com/flowers/potamogeton-natans.php Fig. 9.1 https://hiveminer.com/Tags/leaf%2Cstomata Fig. 9.2 (a) Identify the cell labelled X and state its adaptation for its function. identity of cell X: …………………………………………………… adaptation: …………………………………………………………………………………………... ………………………………………………………………………………………….. [2] X

2019 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School IP Biology [Turn over (b) Using Fig. 9.1 and Fig. 9.2, explain two ways in which the leaf is well adapted for its function in its habitat. 1. …………………………………………………………………………………………... ………………………………………………………………………………………….. 2. …………………………………………………………………………………………... ………………………………………………………………………………………….. [2]

2019 End-of-Year Examination Secondary Three IP 6 Nanyang Girls’ High School IP Biology Fig. 9.3 below shows the volume of oxygen released by Potamogeton natans. Fig. 9.3 (c) Explain why there is no net oxygen produced at 6 am. …………………………………………………………………………………………... ………………………………………………………………………………………….. …………………………………………………………………………………………... ………………………………………………………………………………………….. [2] (d) Explain the shape of the graph from 6 am to midday. ………………………………………………………………………………………….. ………………………………………………………………………………………….. …………………………………………………………………………………………... ………………………………………………………………………………………….. …………………………………………………………………………………………... ………………………………………………………………………………………….. [3] oxygen released up by plant/ arbitrary units oxygen taken up by plant/ arbitrary units 6 pm midnight midday 6 am 0.5 0.5

2019 End-of-Year Examination Secondary Three 7 Nanyang Girls’ High School IP Biology [Turn over (e) The volume of oxygen used by a plant remains relatively constant throughout the day. However, the volume of oxygen released by the plant varies throughout the day as shown in Fig. 9.3. Explain why. …………………………………………………………………………………………... ………………………………………………………………………………………….. [total: 10] [1]

2019 End-of-Year Examination Secondary Three IP 8 Nanyang Girls’ High School IP Biology Question 10 is in the form of an Either/Or question. Only one part should be answered. 10 Either Cheryl conducted an experiment to measure the transpiration rates of two different species of plants, A and B. Using a potometer, she measured the volume of water lost by the plants at 5 minute intervals, for a total of 15 minutes. Cheryl’s data is recorded in Table 10.1. Table 10.1 plant species volume of water lost by plant at x minute / cm3 0 min 5 min 10 min 15 min A 0.0 1.0 2.6 3.6 B 0.0 0.6 1.2 1.8 (a) (i) Draw a graph to represent the results. [5]

2019 End-of-Year Examination Secondary Three 9 Nanyang Girls’ High School IP Biology [Turn over (ii) Use your graph to calculate the transpiration rate of plant species B. Show your working clearly. Give your answer to 2 significant figures. [3] (b) Cheryl lives in a small town near the Simpson Desert. The climate is very hot and dry. She is thinking of growing plants in her backyard. Evaluate, with reasons, which species, A or B, would be suitable for growing in Cheryl’s backyard. …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... [total: 10] [2]

2019 End-of-Year Examination Secondary Three IP 10 Nanyang Girls’ High School IP Biology 10 Or (a) A 10-year coronary heart disease risk is an indication of how likely a person would develop heart disease in the next 10 years. Individuals with a score of less than 10% are considered to be at low risk, 10 – 20% at moderate risk, and above 20% at high risk. Table 10.2 shows the estimated 10-year coronary heart disease risk, by gender, in adults 55 years of age. The adults fall into four general categories, A, B, C and D. [source:https://www.heart.org/idc/groups/heart-public/@wcm/@sop/@smd/documents/downloadable/ucm_449846.pdf] Table 10.2 Using the information in Table 10.2, draw a bar chart showing a clear comparison between males and females within each category. category 10-year coronary heart disease risk by gender /% male female A 5 5 B 13 8 C 25 20 D 37 27