| Date | May 2013 | Marks available | 3 | Reference code | 13M.3.SL.TZ1.9 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | Explain | Question number | 9 | Adapted from | N/A |
Question
Outline the process of glycolysis.
Explain the relationship between the action spectrum and the absorption spectrum of photosynthetic pigments in plants.
Markscheme
a. takes place in cytoplasm;
b. glucose is phosphorylated/two molecules/moles of ATP used;
c. one hexose sugar/glucose is converted into two three-carbon/3C molecules/hydrolysis;
d. pyruvate is formed/oxidation of glucose to pyruvate;
e. small yield/net gain of two ATP;
f. net gain of two NADH + H+;
g. does not require/use oxygen/anaerobic process;
a. each photosynthetic pigment has a different absorption spectrum;
b. as light of different wavelengths is absorbed differently;
c. absorption spectra combine to create the action spectrum / action spectrum shows how much photosynthesis occurs at each wavelength;
d. so plant can use a wider range of wavelengths for photosynthesis;
e. appropriate labelled diagram of absorption and action spectra;
f. action spectrum takes into account “in vivo”/actual environmental conditions;
Examiners report
A relatively small number of candidates answered this option, but those who did generally achieved well.
Most candidates were able to outline glycolysis.
A relatively small number of candidates answered this option, but those who did generally achieved well.
The question was generally poorly answered.
