[2026] PTE Academic Reading - Multiple Choice, Multiple Answers

Microplastics, defined as plastic particles smaller than five millimeters, have become a pervasive pollutant in global marine environments.These tiny fragments originate from a variety of sources and are generally categorized into two main types: primary and secondary microplastics.Primary microplastics are intentionally manufactured at a microscopic size for use in products like cosmetics and industrial abrasives.Conversely, secondary microplastics result from the gradual degradation of larger plastic debris, such as water bottles and fishing nets, under the influence of UV radiation and physical weathering.

One of the most significant ecological concerns surrounding microplastics is their ingestion by a wide array of marine organisms.Filter feeders, such as bivalves and certain species of whales, are particularly susceptible to consuming these particles inadvertently alongside their natural prey.Once ingested, microplastics can cause physical blockages in the digestive tracts of these animals, leading to malnutrition and starvation.Furthermore, this ingestion facilitates bioaccumulation, where the concentration of plastics increases progressively as they are transferred up the marine food web, ultimately posing a potential risk to human consumers.

Beyond their physical hazards, microplastics also present a profound chemical threat to marine ecosystems.Due to their large surface area to volume ratio and hydrophobic nature, these particles act like sponges, absorbing heavy metals and persistent organic pollutants (POPs) from the surrounding seawater.When marine animals ingest these contaminated plastics, the toxic substances can leach into their tissues, potentially disrupting endocrine functions and impairing reproductive success.Addressing this complex issue requires a multi-faceted approach, emphasizing not only the clean-up of existing ocean plastics but also a drastic reduction in single-use plastic production at the source.