Biology · 2000 · November · Paper 2 · HL · Question paper
BiologyQuestion paper2000HLNovember
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This question paper is listed under Biology in the 2000 examination archive. Its catalogue level is HL. The catalogue session is November. 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
Wednesday 15 November 2000 (afternoon)
2 hours 15 minutes
N00/410/H(2)
INTERNATIONAL BACCALAUREATE
BACCALAURÉAT INTERNATIONAL
BACHILLERATO INTERNACIONAL
880-181 16 pages
INSTRUCTIONS TO CANDIDATES
! Write your candidate name and 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. You may use the lined pages at the end of
this paper or continue your answers in a continuation answer booklet, and indicate
the number of booklets used in the box below. Write your name and candidate
number on the front cover of the continuation answer booklets, and attach them to
this question paper using the tag provided.
! At the end of the examination, indicate the numbers of the Section B questions answered in the
boxes below.
Number
Name
TOTAL
/72
TOTAL
/72
TOTAL
/72
NUMBER OF CONTINUATION
BOOKLETS USED .........
/20/20/20QUESTION .........
/20/20/20QUESTION .........
SECTION B
/32/32/32ALLSECTION A
IBCATEAM LEADEREXAMINERQUESTIONS ANSWERED
SECTION A
Candidates must answer all questions in the spaces provided.
1. Very large numbers of microscopic algae exist in ocean communities away from land.
Approximately half of all photosynthesis on Earth occurs in these algae. They also carry out cell
respiration. Marine biologists investigated ocean water at a series of depths at many sites. They
measured the changes in oxygen content of the water in the light and in the dark.
From their measurements they calculated:
- the rate of oxygen production by the photosynthesising algae
- the rate of oxygen use in cell respiration by the whole community.
The difference between the rate of oxygen production and oxygen use is the net oxygen
production of the community.
The results for one site in the North Atlantic are shown below:
Oxygen production and net oxygen production /✙ mol O dm day2 −3 −1
Key
net oxygen
oxygen
production
production
Depth / m
-2 0 2 4 6 8
20
40
60
0
[Source: P J le B Williams, Nature, (1998), 394, pages 55-57]
[2]
(a) (i) Using only the data in the graph, outline the relationship between depth
File information
Subject
Biology
Document type
Question paper
Year
2000
Session
November
Level
HL
Paper
2
Examination zone
Not labelled in the archive
Language
Not labelled in the archive
File size
326 KB
Pages
16
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