| Date | November 2015 | Marks available | 1 | Reference code | 15N.1.HL.TZ0.16 |
| Level | Higher level | Paper | Paper 1 | Time zone | TZ0 |
| Command term | Question number | 16 | Adapted from | N/A |
Question
Which hypothesis is supported by evidence from ecological research?
A. Decomposers are the final stage in the food chain.
B. Producers depend upon consumers more than on decomposers.
C. Decomposers help to recycle energy from food chains.
D. Producers use nutrients that decomposers help to recycle.
Markscheme
D
Examiners report
Some comments mention this question is tricky, especially in the use of the term "stage" of food chain. This did not seem to confuse candidates, as only a few answered A. This answer is not correct, as tertiary or quaternary consumers are the final stage of the food chain.
