Biology · 2005 · May · Paper 2 · SL · TZ1 · Question paper
BiologyQuestion paper2005SLMay
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This question paper is listed under Biology in the 2005 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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BIOLOGY
STANDARD LEVEL
PAPER 2
Wednesday 11 May 2005 (afternoon)
1 hour 15 minutes
M05/4/BIOLO/SP2/ENG/TZ1/XX
IB DIPLOMA PROGRAMME
PROGRAMME DU DIPLÔME DU BI
PROGRAMA DEL DIPLOMA DEL BI
c
22056011
2205-6011 10 pages
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 one question 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 ques tions answered in the candidate
box on your cover sheet and indicate the number of sheets used in the appropriate box on your
cover sheet.
[Personal identifier removed]
SECTION A
Answer all the questions in the spaces provided.
1. Lectins are proteins that some plants synthesise and store in their cells. Lectins have properties
that make plant tissues unpalatable to insects and nematode worms. Crop plants that do not
naturally produce lectins have b een genetically modified to pr oduce them. For example, genes
coding for two types of lectin ha ve been transferred to potatoes ( Solanum tuberosum). One of the
genes (GNA) was obtained from snowdrop plants ( Galanthus nivalis) and the other (Con A) from
jackbeans (Canavalia virosa). To obtain a series of genetically modified varieties, gene transfer
was carried out repeatedly on one type of potato (Désirée). The lectin content of the leaves and the
level of control of aphids a nd nematodes were measured in each genetically modified potato
variety. The table below shows the results. The figures for control are the percentage reduction in
the number of aphids and nemat odes that fed on the plants, comp ared with the unmodified potato
plants.
37410.044Con A 4
0480.024Con A 31
22420.340GNA 74
38290.320GNA 71
17490.600GNA 2#28
22130.600GNA pBG650
Nematode control / %Aphid control / %
Lectin content / %
of total soluble
leaf protein
Genetically
modified potato
varieties
[Source: Griffiths, Geoghegan and Robertson, Journal of
File information
Subject
Biology
Document type
Question paper
Year
2005
Session
May
Level
SL
Paper
2
Examination zone
TZ1
Language
Not labelled in the archive
File size
390 KB
Pages
10
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