| Date | May 2012 | Marks available | 1 | Reference code | 12M.1.SL.TZ2.29 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 29 | Adapted from | N/A |
Question
Gases in the Earth’s atmosphere believed to be responsible for the greenhouse effect include
A. sulfur dioxide, nitrous oxide, water.
B. methane, carbon monoxide, ozone.
C. carbon dioxide, sulfur trioxide, carbon monoxide.
D. water, methane, nitrous oxide.
Markscheme
D
Examiners report
Most candidates chose the correct response, B. Many teachers commented that various sources support response D as correct. Both B and D were therefore accepted as correct.
Syllabus sections
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