Biology · 2010 · May · Paper 3 · SL · TZ1 · Question paper

2210-6012 29 pages M10/4/BIOLO/SP3/ENG/TZ1/XX+ Tuesday 18 May 2010 (morning) Biology STANDARD level PAPe R 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 in the spaces provided. You may continue your answers on answer sheets. Write your session number on each answer sheet, and attach them to this examination paper and your cover sheet using the tag provided. • At the end of the examination, indicate the letters of the Options answered in the candidate box on your cover sheet and indicate the number of answer sheets used in the appropriate box on your cover sheet. 1 hour [Personal identifier removed] © International Baccalaureate Organization 2010 0129 22106012 2210-6012 – 2 – M10/4/BIOLO/SP3/ENG/TZ1/XX+ Option A — Human nutrition and health A1. A study was made to look at the effect of breastfeeding on infant health. The infants studied were all healthy at birth. They were classified as never breastfed, partially breastfed or only breastfed, based on their feeding status in the first three months of life. The frequency of health care use was assessed for each of these groups, for three illnesses (lower respiratory infection, middle ear infection and gastroenteritis). The table below indicates the frequency of initial and follow-up visits to the doctor, prescription of medication and hospitalizations during the first year of life. Follow-up visits and medication were seldom needed for gastroenteritis. Mean frequency of healthcare use per child in the first year of life Never breastfed Partially breastfed Only breastfed Lower respiratory infection Mean number of visits to doctor 0.46 0.44 0.40 Follow-up visits 0.07 0.01 0.02 Medications 0.27 0.21 0.19 Hospitalization 0.02 0.02 0.01 Middle ear infection Mean number of visits to doctor 2.04 1.88 1.51 Follow-up visits 1.02 1.44 0.76 Medications 2.04 1.88 1.51 Gastroenteritis Mean number of visits to doctor 1.50 0.94 0.45 Hospitalizations 0.11 0.11 0.04 [Source: Reproduced with permission from Pediatrics, V ol 103, pages 870-876, Copyright 1999 by the AAP