Explain how the following land-based activities could have a damaging effect on marine ecosystems within the Coral Triangle: deforestation.

Explain how the following land-based activities could have a damaging effect on marine ecosystems within the Coral Triangle: agricultural activity.

This question requires “Resource Booklet - May 2019 SL paper 1”, available under the "your tests" tab > supplemental materials.

Award [1] for identifying the problem, and [1] for explaining its effect on marine ecosystems.

Do not accept just “soil/coastal erosion” without link to increased sedimentation.

[2 max]

This question requires “Resource Booklet - May 2019 SL paper 1”, available under the "your tests" tab > supplemental materials.

Award [1] for identifying the problem, and [1] for explaining its effect on marine ecosystems.

Do not accept loss of mangroves and its associated effects.

Do not accept just “overgrazing causes soil erosion” without link to increased sedimentation.

[2 max]

Few candidates achieved full marks for this question. Many struggled to link deforestation on land with an impact on marine ecosystems. Common error was to use generic terms such as ‘pollution’ and not name the specific type of pollutant.

This question better answered than Q11a. Many candidates correctly identified fertilizer runoff as causing problems of eutrophication. Common error was to discuss the removal of mangroves rather than focusing specifically on agricultural activity.