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Biology · 2009 · May · Paper 2 · HL · TZ1 · Question paper

BiologyQuestion paper2009HLMay

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This question paper is listed under Biology in the 2009 examination archive. Its catalogue level is HL. 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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2209-6008 10 pages M09/4/BIOLO/HP2/ENG/TZ1/XX Wednesday 6 May 2009 (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 2009 2 2 0 9 6 0 0 8 2 2 0 9 6 0 0 8 2209-6008 – 2 – M09/4/BIOLO/HP2/ENG/TZ1/XX Section a Answer all the questions in the spaces provided. 1. Genetic engineering allows genes for resistance to pest organisms to be inserted into various crop plants. Bacteria such as Bacillus thuringiensis (Bt) produce proteins that are highly toxic to specific pests. Stem borers are insects that cause damage to maize crops. In Kenya, a study was carried out to see which types of Bt genes and their protein products would be most efficient against three species of stem borer. The stem borers were allowed to feed on nine types of maize (A–I), modified with Bt genes. The graph below shows the leaf areas damaged by the stem borers after feeding on maize leaves for five days. Types of maize control A B C D E F G H I 0 10 20 30 40 50 60 70 Leaf area damaged / mm2 Key for species of stem borer: Sesamia calamistis Eldana saccharina Busseola fusca [Source: S Mugo et al., Figure 3 from “Developing Bt maize for resource-poor farmers—Recent advances in the IRMA project”, African Journal of Biotechnology (2005), volume 4, number 13, pp. 1490-1504] (This question continues on the following page)
File information
Subject
Biology
Document type
Question paper
Year
2009
Session
May
Level
HL
Paper
2
Examination zone
TZ1
Language
Not labelled in the archive
File size
375 KB
Pages
10
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