Paragraftan ÇıkarımSoru #10775
Microplastics in Fluvial Systems
While public awareness regarding microplastic contamination has predominantly centered on oceanic gyres, limnologists have revealed that freshwater fluvial systems are equally besieged by synthetic pollutants. Rivers serve not merely as passive corridors transporting urban plastic waste to coastal estuaries; they are active depositional basins where microplastics accumulate across benthic sediments. Synthetic microfibers shed from laundering synthetic textiles and tiny crumb rubber particles pulverized from automobile tires comprise the dominant share of freshwater plastic loads. Because these microscopic polymers resemble natural food particles in size and buoyancy, benthic macroinvertebrates and juvenile fish indiscriminately ingest them. Beyond inducing physical blockages and lacerations in gastrointestinal tracts, microplastics act as sponges that adsorb hydrophobic persistent organic pollutants, such as polychlorinated biphenyls (PCBs), transferring concentrated toxins up the riparian food web. It can be inferred from the text that microplastics pose a chemical hazard to organisms because ----.
- A)they prevent all aquatic plants from absorbing solar photons for photosynthesis
- B)they dissolve instantly into lethal hydrochloric acid upon entering cold water
- C)they emit dangerous radioactive gamma rays into surrounding river sediments
- D)they turn surrounding freshwater into undrinkable hypersaline seawater
- E)they can absorb and concentrate hazardous environmental toxins that bioaccumulate in consumers
Cevabı ve çözümü göster
Doğru cevap: E) they can absorb and concentrate hazardous environmental toxins that bioaccumulate in consumers
Çözüm: Son cümlede mikroplastiklerin hidrofobik kalıcı organik kirleticileri (PCBs) sünger gibi emip besin zincirine yoğunlaştırarak aktardığı belirtilmiştir. Doğru cevap E'dir.