Biology Standard Level Paper III
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This document contains a biology exam for the standard level with 4 questions related to evolution. It provides the instructions to candidates, outlines the scoring rubric, and presents the questions and spaces for answers. The questions address topics like changes in body size over time for a genus of ostracods, the origin of life and eukaryotes, distinguishing features of primates, and implications of gaps in the fossil record for understanding human evolution.
![D1. There is evidence that body size of animals tends to increase over time. In this study,
fossilsand living species from the genus Poseidonamicus, deep-sea ostracods, were used to
test thishypothesis. The numbers on the dotted line represent the number of different
Poseidonamicusspecies found either as fossils or living. For each time period, the average
valve length of allspecies studied is plotted. Valve length is an indication of total body size.
The continuous lineis the estimated temperature of their deep-sea habitat.
(a) Calculate the percentage increase in valve length between the species studied from
40 million years ago and the species from the present day. [2]
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(b) Suggest two reasons for the increase in the number of species of Poseidonamicus
over time. [2]
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(This question continues on the following page)
EJE 2
All statements baccalaureate international 2011 ©](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Biology Standard Level Paper III
- 1. Name Student: Biology Standard Level Paper III 1 hour Wednesday 07 December 2011 INSTRUCTIONS TO CANDIDATES Do not open this examination paper until instructed to do so. Answer all the questions. Answer all in the spaces provided. Use pen only Use clear handwriting Paper III Puntos Nota 18-18 7 16-17 6 13-15 5 10-12 4 8-9 3 6-7 2 1-5 1 Option D — Evolution EJE 1 All statements baccalaureate international 2011 ©
- 2. D1. There is evidence that body size of animals tends to increase over time. In this study, fossilsand living species from the genus Poseidonamicus, deep-sea ostracods, were used to test thishypothesis. The numbers on the dotted line represent the number of different Poseidonamicusspecies found either as fossils or living. For each time period, the average valve length of allspecies studied is plotted. Valve length is an indication of total body size. The continuous lineis the estimated temperature of their deep-sea habitat. (a) Calculate the percentage increase in valve length between the species studied from 40 million years ago and the species from the present day. [2] .................................................................................................................................................. .................................................................................................................................................. .................................................................................................................................................. ........................................................................................................................................ (b) Suggest two reasons for the increase in the number of species of Poseidonamicus over time. [2] .................................................................................................................................................. .................................................................................................................................................. .................................................................................................................................................. ........................................................................................................................................ (This question continues on the following page) EJE 2 All statements baccalaureate international 2011 ©
- 3. (Question D1 continued) (c) Evaluate the hypothesis that changes in size of Poseidonamicus are caused by changes in sea temperature. [3] .................................................................................................................................................. .................................................................................................................................................. .................................................................................................................................................. ........................................................................................................................................ .................................................................................................................................................. ........................................................................................................................................ D2.(a) Describe the processes needed for the spontaneous origin of life on Earth. [3] .................................................................................................................................................. .................................................................................................................................................. .................................................................................................................................................. ........................................................................................................................................ ........................................................................................................................................ (b) Discuss the endosymbiotic theory for the origin of eukaryotes. [3] .................................................................................................................................................. .................................................................................................................................................. .................................................................................................................................................. ........................................................................................................................................ ........................................................................................................................................ EJE 3 All statements baccalaureate international 2011 ©
- 4. D3. (a) Describe two major anatomical features of humans that define them as primates. [2] .................................................................................................................................................. ........................................................................................................................................ ........................................................................................................................................ (b) Discuss the implications of the incompleteness of the fossil record on our understanding of human evolution. [3] .................................................................................................................................................. ........................................................................................................................................ ........................................................................................................................................ .................................................................................................................................................. ........................................................................................................................................ ........................................................................................................................................ ¡Enjoy the Science! EJE 4 All statements baccalaureate international 2011 ©