Which statement about wetlands describes their roles in flood mitigation, water purification, and biodiversity support?

Which statement about wetlands describes their roles in flood mitigation, water purification, and biodiversity support?

• A. They store excess water and provide habitat, but do not affect water quality.
• B. They store excess water, slow runoff, filter pollutants, and provide habitat.
• C. They are mainly decorative wetlands with little ecological function.
• D. They cause flooding and worsen water quality.

Answer: (B)

Wetlands act as natural sponges in the landscape, soaking up excess water and releasing it slowly. This storage and slow release help reduce flood peaks downstream by spreading out and delaying runoff during storms. They also function as a natural filtration system: sediments and pollutants settle in the wetland, nutrients are taken up by plants, and microbial processes break down contaminants, which improves water quality. In addition, the distinctive hydrology, soils, and vegetation create diverse habitats that support a wide range of species, boosting biodiversity. The description that includes storing excess water, slowing runoff, filtering pollutants, and providing habitat best captures these interconnected roles. The other options miss these key functions or mischaracterize wetlands, such as suggesting they have little ecological function, primarily decorative value, or worsen floods and water quality.

Wetlands act as natural sponges in the landscape, soaking up excess water and releasing it slowly. This storage and slow release help reduce flood peaks downstream by spreading out and delaying runoff during storms. They also function as a natural filtration system: sediments and pollutants settle in the wetland, nutrients are taken up by plants, and microbial processes break down contaminants, which improves water quality. In addition, the distinctive hydrology, soils, and vegetation create diverse habitats that support a wide range of species, boosting biodiversity. The description that includes storing excess water, slowing runoff, filtering pollutants, and providing habitat best captures these interconnected roles. The other options miss these key functions or mischaracterize wetlands, such as suggesting they have little ecological function, primarily decorative value, or worsen floods and water quality.