Eutrophication primarily affects which part of the environment?

Eutrophication primarily affects which part of the environment?

• A. Water bodies experience algal blooms due to nutrient enrichment
• B. Soil becomes infertile due to leaching
• C. Air quality is reduced by fertilizer fumes
• D. Wildlife populations decrease due to pesticide use

Answer: (A)

Eutrophication is driven by excess nutrients, especially phosphorus and nitrogen, entering aquatic systems. When these nutrients accumulate in lakes, rivers, or coastal areas, they fuel rapid algae and phytoplankton growth, leading to algal blooms. These blooms can reduce water quality, block sunlight from underwater plants, and, when they die and decompose, use up dissolved oxygen, causing hypoxic conditions that stress or kill aquatic life. So the primary impact is on water bodies, where algal blooms due to nutrient enrichment are the defining change.

The other options relate to different environmental processes: soil leaching involves nutrient loss from soil rather than water enrichment; air quality effects come from airborne fertilizer or pesticide emissions, which is not the main feature of eutrophication; and wildlife declines from pesticide use point to toxic pollutants, not nutrient-driven aquatic blooms.