| Date | November 2009 | Marks available | 3 | Reference code | 09N.3.SL.TZ0.21 |
| Level | Standard level | Paper | Paper 3 | Time zone | TZ0 |
| Command term | Discuss | Question number | 21 | Adapted from | N/A |
Question
Discuss the impacts of a named alien species introduced as a biological control measure.
Markscheme
named alien species e.g. western mosquitofish / small Indian mongoose / rosy wolfsnail;
introduced for removal of pests;
competes with native species;
excessive predation on native species that do not have defences;
impacts industry such as tourism/harvesting of natural resources;
Accept other specific examples of effects.
Examiners report
This was usually not well answered. Many candidates missed the points, as they did not mention an alien species introduced as a biological control measure.
Syllabus sections
Option C: Ecology and conservation » Option C: Ecology and conservation (Core topics) » C.3 Impacts of humans on ecosystems
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