| Date | May 2009 | Marks available | 1 | Reference code | 09M.1.HL.TZ1.30 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 30 | Adapted from | N/A |
Question
Which of the following graphs represents the effect of changing light intensity on the rate of oxygen production by a green plant?
Markscheme
C
Examiners report
Although the examiners agreed this is a good question, it turned out to be a bad discriminator, as most candidates considered B to be the correct answer. Many candidates failed to realize that there is a negative production of oxygen when there is no light as it is consumed in respiration.
Syllabus sections
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