| Date | May 2011 | Marks available | 1 | Reference code | 11M.1.SL.TZ2.20 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 20 | Adapted from | N/A |
Question
Which of the following represent homologous features?
A. Wings in birds and insects
B. The appendix in humans and horses
C. Fins in fish and wings in birds
D. The striped coat of the zebra and the tiger
Markscheme
B
Examiners report
This was the most difficult question in the exam though it was a poor discriminator. The question was criticized by a number of teachers as not appropriate, but the assessment statement upon which it was based (5.4.2: Outline the evidence for evolution provided by … homologous structures.) is an outline so candidates should be able to answer this question.
