Biology · 2010 · May · Paper 2 · HL · TZ2 · Question paper

2210-6014 10 pages M10/4/BIOLO/HP2/ENG/TZ2/XX+ Monday 17 May 2010 (afternoon) Biology HigHER lE vEl Pa PER 2 INSTRUCTIONS TO CANDIDATES • Write your session number in the boxes above. • Do not open this examination paper until instructed to do so. • Section A: answer all of Section A in the spaces provided. • Section B: answer two questions from Section B. Write 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 numbers of the questions answered in the candidate box on your cover sheet and indicate the number of sheets used in the appropriate box on your cover sheet. 2 hours 15 minutes [Personal identifier removed] © International Baccalaureate Organization 2010 0110 22106014 2210-6014 – 2 – M10/4/BIOLO/HP2/ENG/TZ2/XX+ Section a Answer all the questions in the spaces provided. 1. Migrating birds must refuel along the way in order to continue flying. A field study was conducted among four different species of migrating birds known to stop at high quality and low quality food sites. Two techniques were used to assess food quality in the stopover sites. Birds were captured and weighed at the two sites. Blood samples were taken from the birds to determine nutrient levels in their blood. The two techniques were compared for their effectiveness. The table below shows data collected from the two sites during one season. Site 1 Site 2 Species N (number captured) Mean bird mass / g N (number captured) Mean bird mass / g Hermit thrush 46 29.8 28 28.3 White-throated sparrow 47 27.9 48 27.2 American robin 8 78.3 10 77.6 Magnolia warbler 30 8.4 10 8.2 [Source: adapted from C Guglielmo, et al., (2005), Physiological and Biochemical Zoology, 78(1), pages 116 –125] ( a) Considering all the birds sampled, identify which species was sampled the most and which was sampled the least. [1] Most: ............................................................... Least: ............................................................... ( b) Using the data from the table, calculate the percentage difference in mean