| Date | November 2015 | Marks available | 1 | Reference code | 15N.1.HL.TZ0.29 |
| Level | Higher level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Question number | 29 | Adapted from | N/A |
Question
The image shows a chloroplast.
During photosynthesis, what happens in the chloroplast at the location labelled lumen?
A. Protons accumulate.
B. Pyruvate undergoes decarboxylation.
C. NADH is oxidized.
D. Oxygen is produced.
Markscheme
A
Examiners report
There were many comments in the G2s on this question. Most good candidates answered that protons accumulate in the lumen. This is the best answer to the question, as there are many protons throughout the lumen. Photolysis occurs in the photosystem II, in the oxygen-evolving complex; therefore oxygen is produced in the inner surface of the membrane (so A is the correct answer).
Syllabus sections
Additional higher level » Topic 8: Metabolism, cell respiration and photosynthesis » 8.3 Photosynthesis
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