Ocean plastic pollution harms marine ecosystems through persistent debris, microplastic formation, ingestion, entanglement, toxin transport, and movement by currents or wind.
Coverage 2017–2023 · Updated 16 Jul 2026
Ocean plastics persist because they are non-biodegradable; large macroplastics and small microplastics expose organisms in different ways.
| Plastic scale | Example effects on marine life |
|---|---|
| Macroplastic | Entanglement, drowning, injury or blockage after ingestion |
| Microplastic | Ingestion by small organisms, transfer through food webs and exposure to associated chemicals |
Weathering fragments plastic but does not mineralize it, while rivers, wind, fishing and currents continually redistribute material.
Clear scientific communication and popular-media coverage changed public perception and helped drive measures to reduce plastic pollution.
Detection alone does not quantify biological effect; particle size, polymer, dose and exposure duration must be evaluated.
This objective is assessed through essay response, commonly using State / Outline / Suggest.
State / Outline / Suggest / Explain / Describe
Build the answer around this relationship: Macroplastics can kill organisms through entanglement, choking, gut blockage, and starvation.
Treating plastic pollution only as litter, without explaining ingestion, entanglement, or digestive blockage.
Representative question
Explain the consequences of plastic pollution in marine environments.
Core D4.2 is secure when students can judge whether a system is being stabilized or pushed toward change. The route is: identify the stability support or disturbance, explain the mechanism, and state the ecosystem consequence using evidence.
Core transfer questions ask students to explain why an ecosystem remains stable or why a disturbance pushes it toward change. Strong answers do not list threats; they explain mechanisms such as lost rainfall recycling, trophic cascade, overharvest, nutrient enrichment, toxin biomagnification, plastic movement, or restoration through rewilding.
