Biology Regents Practice Exam

Why are microbeads a concern for aquatic biologists?

1. They make lakes and rivers cloudy

2. They can prevent drainage problems in pipes

3. They could be mistaken for food by some species

4. They may clog fishing nets

The correct answer is: They could be mistaken for food by some species

Microbeads are a significant concern for aquatic biologists primarily because they can be mistaken for food by various aquatic organisms. These tiny plastic particles, often found in personal care products, can enter waterways through wastewater and runoff. When these organisms consume microbeads, it can lead to various harmful effects, including physical harm, malnutrition, and toxicity from any pollutants that may adhere to the microbeads. The ingestion of microplastics can disrupt the digestive systems of fish and other wildlife, potentially leading to population declines and disruptions in the food chain. Other possible options in the question do not capture the primary environmental and biological risks associated with microbeads. For instance, while microbeads may contribute to water clarity issues or create challenges in fishing, these factors are secondary compared to the direct harm they cause by being ingested by wildlife.