| Date | November 2012 | Marks available | 1 | Reference code | 12N.1.HL.TZ0.13 |
| Level | Higher level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Question number | 13 | Adapted from | N/A |
Question
The diagram shows a pyramid of energy for a wetland environment. What units would be appropriate for the values shown?
A. kg yr–1
B. kJ m–2 yr–1
C. J m–2
D. mg dry mass m–3
Markscheme
B
Examiners report
A relatively low discrimination index for this question suggests that some of the stronger candidates were unaware that pyramids of energy are showing energy flow, which must be over a period of time. The time period conventionally is one year, so the answer was B.
