| Date | November 2013 | Marks available | 1 | Reference code | 13N.3.SL.TZ0.9 |
| Level | Standard level | Paper | Paper 3 | Time zone | TZ0 |
| Command term | State | Question number | 9 | Adapted from | N/A |
Question
State the site of the light-independent reactions of photosynthesis.
[1]
a.
Explain the relationship between the structure of the chloroplast and its function.
[3]
b.
Markscheme
stroma (of chloroplast)
a.
large surface area of thylakoids/grana for light absorption/electron transport chain;
(small) space inside thylakoids for accumulation of protons;
(fluid) stroma for enzymes in Calvin cycle/light independent reactions;
arrangement of photosystems to allow electron transport to take place;
double membrane on the outside allows separation from rest of cell;
presence of DNA/ribosomes for protein synthesis;
starch grains store carbohydrate (from photosynthesis);
b.
Examiners report
Most candidates correctly identified the stroma of the chloroplast as the site of the light-independent reactions.
a.
Many candidates could get 3 marks for the explaining the relationship between structure and function in the chloroplast.
b.
Syllabus sections
Additional higher level » Topic 8: Metabolism, cell respiration and photosynthesis » 8.3 Photosynthesis
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