| Date | November 2011 | Marks available | 1 | Reference code | 11N.1.HL.TZ0.26 |
| Level | Higher level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Question number | 26 | Adapted from | N/A |
Question
The following diagrams (not to scale) represent the fossilized forelimbs of three horses living at different times, none of which are alive today.
The diagrams provide evidence for which of the following?
A. Pentadactyl limb
B. Domestication of animals
C. Homologous structures
D. Change in the characteristics of species
Markscheme
D
Examiners report
This question provoked a lot of controversy and proved to be a poorly discriminating question. The question proved to be hard for more able students to answer. Many candidates chose homologous structures. One probable reason is that the answer referred to change in species throughout time but the question was showing the progression in change in different genera. As this question was correct, it was decided not to eliminate it but the grade boundary for 6/7 was carefully considered to ensure fairness.
