Nitrates and phosphates are nutrients that lead to which problem in aquatic systems?

• A. Nitrates and Phosphates
• B. Sediments
• C. Heavy Metals
• D. Algal Blooms

Answer: (D)

Excess nutrients in water bodies stimulate rapid growth of algae and other aquatic plants. Nitrates and phosphates act like fertilizers for phytoplankton, so when they enter a system in high amounts, algae multiply and form blooms. These blooms can shade deeper waters, disrupt light availability, and, as they die and decompose, consume a lot of dissolved oxygen. The resulting low-oxygen conditions can create hypoxia or dead zones, a hallmark of eutrophication driven by nutrient enrichment. Sediments describe suspended particles, not the nutrient input themselves; heavy metals are toxic pollutants, not nutrients that fuel growth. So the problem driven by these nutrients is the formation of algal blooms.