| Date | November 2015 | Marks available | 1 | Reference code | 15N.1.SL.TZ0.21 |
| Level | Standard level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Question number | 21 | Adapted from | N/A |
Question
What contributes to the enhanced greenhouse effect?
A. Ozone from violent thunderstorms
B. Carbon particles in diesel engine exhaust
C. Methane from agricultural sources
D. Carbon dioxide from active volcanoes around the world
Markscheme
C
Examiners report
Most candidates were able to realize that methane from agriculture is a greater contributor to the greenhouse effect than carbon dioxide from volcanoes. Many good candidates did believe it was the carbon particles from engines, failing to realize this is not a gas.
Syllabus sections
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