| Date | May 2011 | Marks available | 2 | Reference code | 11M.3.SL.TZ1.21 |
| Level | Standard level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | State | Question number | 21 | Adapted from | N/A |
Question
The introduction of alien species and the release of environmental pollutants are examples of human activities that have an impact on the environment.
Alien species may arrive in an ecosystem due to accidental or deliberate release. State the impact of one named example of deliberate release.
Markscheme
example e.g. Cane Toads/Bufo marinus;
effect e.g. predation of native invertebrates;
Other possible examples:
Accept other suitable examples. Accept common name or systematic name.
Google to check others.
Examiners report
The problem of alien species has been in the paper in the past, normally asking about accidental releases. This time the question was about deliberate releases, and so many answers were not stating the correct type of example. Also the impact of the release was required in order to gain the two marks.
