| Date | May 2011 | Marks available | 1 | Reference code | 11M.1.SL.TZ1.13 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 13 | Adapted from | N/A |
Question
What is the source of the oxygen released into the air as a product of photosynthesis?
A. Chlorophyll
B. Carbon dioxide only
C. Water only
D. Both water and carbon dioxide
Markscheme
C
Examiners report
This question seemed to cause problems for many candidates, with many choosing option D rather than the correct answer C. There was a complaint in the G2 forms that asking students to identify the source of oxygen in the process of photosynthesis was beyond the scope of the SL syllabus. However, it is assessment statement 3.8.5 in the core syllabus.
Syllabus sections
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