Biology · 2018 · May · Paper 2 · SL · TZ2 · Question paper

20EP01 [Personal identifier removed] Biology Standard level Paper 2 © International Baccalaureate Organization 2018 20 pages 2218 – 6017 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 questions. • Section B: answer one question. • Answers must be written within the answer boxes provided. • A calculator is required for this paper. • The maximum mark for this examination paper is [50 marks]. 1 hour 15 minutes Monday 14 May 2018 (afternoon) M18/4/BIOLO/SP2/ENG/TZ 2/XX 20EP02 – 2 – Section A Answer all questions. Answers must be written within the answer boxes provided. 1. Edible insects have been a part of traditional human diets in many countries. For example, crickets are insects commonly eaten in Asia and Africa. Many studies have looked at the prospects of raising insects on a commercial scale for direct human consumption as food or indirectly by feeding insects to farm animals. One factor to consider is which organisms are most efficient at converting the feed they eat into animal protein that can be consumed. A study compared the percentage of mass that was edible in two common farm animals and in crickets. Percentage of mass which is edible 4080 55 Crickets Chickens Cattle Feed conversion ratio 25 20 15 10 5 0 Key: kg feed kg edible mass kg feed kg live mass Crickets Chickens Cattle [Source: Food and Agriculture Organization of the United Nations. 2013. van Huis, et al., Forestry Paper 171, page 60. http://www.fao.org/docrep/018/i3253e/i3253e00.htm. Reproduced with permission.] (This question continues on the following page)