Biology · 2004 · May · Paper 2 · HL · TZ2 · Question paper
BiologyQuestion paper2004HLMay
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This question paper is listed under Biology in the 2004 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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BIOLOGY
HIGHER LEVEL
PAPER 2
Tuesday 11 May 2004 (afternoon)
2 hours 15 minutes
M04/412/H(2)
IB DIPLOMA PROGRAMME
PROGRAMME DU DIPLÔME DU BI
PROGRAMA DEL DIPLOMA DEL BI
c
224-138 10 pages
INSTRUCTIONS TO CANDIDATES
y Write your candidate number in the box above.
y Do not open this examination paper until instructed to do so.
y Section A: answer all of Section A in the spaces provided.
y Section B: answer two questions from Section B. Write your answers on answer sheets.
Write your candidate number on each answer sheet, and attach them to this
examination paper and your cover sheet using the tag provided.
y 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. Marine iguanas (Amblyrhynchus cristatus) are herbivorous lizards that are endemic to the
Galapagos islands in the Pacific Ocean. They wa rm their bodies by basking on rocks next to the
sea and then dive into the water to feed on algae. Microorganisms in their guts help to digest the
algae. In 1998, the algae disappeared from most areas as a result of El Niño, an occasional
disturbance to conditions in the ocean around the Galapagos islands.
When marine iguanas are subjected to stress, leve ls of the hormone corticosterone rise in their
blood. Biologists measured blood corticosterone le vels in randomly selected individuals on six of
the Galapagos islands, in May 1998 and again in May 1999. The marine iguanas’ mass and body
length were measured at the same time. A body condition index was calculated from the mass and
body length. Individuals with an index of 30 or less are extremely thin. The fattest individuals
have an index of 60–70. The scattergraph be low shows the body condition index and blood
corticosterone levels of individuals on Santa Fe, one of the six islands sampled. Two regression
lines are shown, for body condition indices above and below 35.
Corticosterone
/ng ml–1
................................................ 40
30
20
10
0
20 30 40 50 60 70
1998
File information
Subject
Biology
Document type
Question paper
Year
2004
Session
May
Level
HL
Paper
2
Examination zone
TZ2
Language
Not labelled in the archive
File size
279 KB
Pages
10
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