| Date | May 2013 | Marks available | 1 | Reference code | 13M.1.SL.TZ2.19 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Question number | 19 | Adapted from | N/A |
Question
At each trophic level energy is lost. How is this energy regained by the ecosystem?
A. Heat
B. Nutrients
C. Photosynthesis
D. Recycling
Markscheme
C
Examiners report
Five teachers expressed concern over this question, primarily over the use of the term ‘regained’. Answer C is the only reasonable answer to the question of how an ecosystem maintains energy supply for food chains.
Syllabus sections
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