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Biology · 2017 · May · Paper 2 · SL · TZ2 · Question paper

BiologyQuestion paper2017SLMay

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This question paper is listed under Biology in the 2017 examination archive. Its catalogue level is SL. The catalogue session is May. The information below helps you identify the document before opening the complete PDF. Subject, year and session labels come from the archive catalogue; the original cover remains the reference if a label differs. A file is not automatically suitable for your current syllabus simply because its subject name matches.

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20EP01 [Personal identifier removed] Biology Standard level Paper 2 © International Baccalaureate Organization 2017 20 pages 2217 – 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 1 May 2017 (afternoon) M17/4/BIOLO/SP2/ENG/TZ2/XX 20EP02 – 2 – Section A Answer all questions. Answers must be written within the answer boxes provided. 1. Consumption of dark chocolate has been shown to have health benefits. A study was undertaken to see the effects of epicatechin (Epi), a substance in dark chocolate, on the aerobic capacity of leg muscles of mice. A group of adult mice was used to measure the effects of a low dose of Epi given over 15 days. The mice were divided into four groups and given either water or Epi and were either kept idle (no exercise) or made to exercise on a treadmill. After 15 days, the results were analysed. The blood capillary density in leg muscle was measured under the light microscope. Capillary density / capillaries mm –2 1200 1000 800 600 400 200 0 Key: no exercise exercise p < 0.05 Water Epi [Source: adapted from L Nogueira, et al., (2011), The Journal of Physiology, 589 (part 18), Wiley, pages 4615 – 4631] (a) (i) State the significance of the statement: p < 0.05. [1] .......................................................................... (ii) Outline the trends in capillary density in the results of this experiment. [2] .......................................................................... .......................................................................... .......................................................................... .......................................................................... .......................................................................... .......................................................................... (This question
File information
Subject
Biology
Document type
Question paper
Year
2017
Session
May
Level
SL
Paper
2
Examination zone
TZ2
Language
Not labelled in the archive
File size
1.1 MB
Pages
20
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