Biology · 2013 · May · Paper 3 · SL · TZ2 · Question paper

32 pages M13/4/BIOLO/SP3/ENG/TZ2/XX Tuesday 14 May 2013 (morning) Biology STANDARD level PAPeR 3 INSTRUCTIONS TO CANDIDATES • Write your session number in the boxes above. • Do not open this examination paper until instructed to do so. • Answer all of the questions from two of the Options. • Write your answers in the boxes provided. • A calculator is required for this paper. • The maximum mark for this examination paper is [36 marks]. 1 hour © International Baccalaureate Organization 2013 Examination code 2 2 1 3 – 6 0 1 8 [Personal identifier removed] 0132 2213601 8 – 2 – M13/4/BIOLO/SP3/ENG/TZ2/XX 0232 Option A — Human nutrition and health A1. Malnutrition affects the body mass index (BMI) of mothers. The height and mass of over 7000 mothers in Ethiopia and the sex of their most recently born child was recorded. The graph shows the percentage of mothers with a BMI below 18.5 and the percentage of their most recent births that were males in 11 regions across Ethiopia. Male offspring / % 54 53 52 51 50 49 0 Harari Affar Amhara Addis Oromiya Ben-Gumz SNNP Gambela Dire Dawa Somali Tigray 15 20 25 30 35 40 45 Mothers with BMI below 18.5 / % [Source: Aryeh D. Stein, Paul G. Barnett, Daniel W. Sellen, Maternal undernutrition and the sex ratio at birth in Ethiopia: evidence from a national sample, Proc. R. Soc. Lond. B (Suppl.), 271, 2004, pages S37–S39, by permission of the Royal Society.] (a) State the regions with the highest and lowest percentage of male offspring. [1] Region with highest percentage: ....................................................................... Region with lowest percentage: ....................................................................... (This question continues on the following page)