| Date | November 2013 | Marks available | 1 | Reference code | 13N.1.SL.TZ0.10 |
| Level | Standard level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Question number | 10 | Adapted from | N/A |
Question
What is light energy used for in photolysis?
A. Formation of hydrogen and oxygen
B. Formation of carbon dioxide only
C. Formation of ATP and glucose
D. Formation of oxygen only
Markscheme
A
Examiners report
This question had the highest discrimination index on the paper with the better candidates correctly choosing A and almost all other candidates incorrectly selecting C. The top candidates realized that light is used in the light dependent reactions so looked for the products of this stage, while the weaker candidates were considering the final products of photosynthesis.
Syllabus sections
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