Discussion
Consider the following statements about microplastics :
1. They are small pieces of plastic less than 5 mm in length.
2. They consist of carbon and hydrogen atoms bound together in polymer chains.
3. They can adsorb persistent organic pollutants (POPs), potentially increasing the toxicity of the particles.
4. They can be inhaled from the air and absorbed through the skin.
How many of the above statements is/are correct ?
Answer: D
All four statements are accepted: All four.
Microplastics are conventionally defined as plastic particles smaller than 5 mm. Most plastics are polymers whose backbone chains are made of carbon and hydrogen. Because their surfaces are hydrophobic, microplastics adsorb persistent organic pollutants such as PCBs and DDT from water, concentrating them and potentially making the particles more toxic when eaten by organisms.
The recognised routes of human exposure include ingestion, inhalation of airborne particles, and skin contact, which the key treats as absorption through the skin, so the fourth statement is counted as correct.
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