NYGH 2021-S3EOY-IP Bio P2B

Class Register Number Name End-of-Year Examination 2021 Secondary Three IP BIOLOGY Paper 2 1 hour 45 minutes Thursday 7 October 2021 0845-1030 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 11 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, tick 11 Either or 11 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: LZJ, TZZ This document consists of 6 printed pages. NANYANG GIRLS’ HIGH SCHOOL [Turn over B

2021 End-of-Year Examination Secondary Three 2 Nanyang Girls’ High School IP Biology Section B Answer three questions. Question 11 is in the form of an Either/Or question. Only one part should be answered. 9 The concentration of carbon dioxide in the air a bove a field of maize between 05:00 and 21 :00 was measured. Table 9.1 shows the results. Table 9.1 time of the day 05:00 07:00 09:00 11:00 13:00 15:00 17:00 19:00 21:00 carbon dioxide concentration/ % 0.029 0.021 0.012 0.006 0.003 0.005 0.013 0.019 0.030 (a) Plot this data on the grid below. You are not required to give the title of your graph. [4]

2021 End-of-Year Examination Secondary Three 3 Nanyang Girls’ High School IP Biology [Turn over (b) Describe and explain the change in carbon dioxide concentration from 13:00 and 21:00. ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ………………………………………………………...………………………………….…………….[4] (c) Suggest and explain the change in oxygen concentration in the air above the maize from 07:00 to 13:00. ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… …………………………………………………….……………………………………..……………..[2] [Total: 10]

2021 End-of-Year Examination Secondary Three 4 Nanyang Girls’ High School IP Biology 10 There are many ways in which substances move in and out of cells in living organisms. (a) Explain why hydrogen ions do not pass through the phospholipid bilayer. ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… …………………………………………………….………………………………….….……………..[2] (b) Compare active transport and facilitated diffusion. ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………..…………………………………….……………..[5] (c) Explain how root hair cells maintain a high ion concentration and why this is important. ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………..…………………………………….……………..[3] [Total: 10]

2021 End-of-Year Examination Secondary Three 5 Nanyang Girls’ High School IP Biology [Turn over 11 Either (a) State four ways in which the behaviour of the chromosomes in meiosis differs from the behaviour of chromosomes in mitosis. ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………..…………………………………….……………..[4] (b) Explain the importance to an organism of mitosis, ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………..…………………………………….……………..[3] meiosis. ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………..…………………………………….……………..[3] [Total: 10]

2021 End-of-Year Examination Secondary Three 6 Nanyang Girls’ High School IP Biology 11 Or (a) Describe how carbon in the atmosphere can become part of a starch molecule. ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………..…………………………………….…………….[6] (b) Describe the similarities and differences between the xylem and phloem tissue. ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………………………………………….…………………… ……………………………………………………..…………………………………….…………….[4] [Total: 10] End of Paper