Which pollutants cause excessive algae growth in water bodies?

Which pollutants cause excessive algae growth in water bodies?

• A. Organic Chemicals
• B. Inorganic Chemicals
• C. Nitrate Standards
• D. Plant Nutrients

Answer: (D)

Excess nutrients act as fertilizer for algae. Plant nutrients, especially nitrogen and phosphorus, enter water bodies from fertilizers, runoff, and waste. When these nutrients are abundant, algae and other phytoplankton can grow rapidly, causing blooms. This rapid growth can block light, alter habitat, and, when the algae die and decompose, deplete dissolved oxygen, leading to further ecological problems like dead zones. That direct link between nutrient input and algal growth makes plant nutrients the right answer. Other options describe broader pollutant categories or regulatory limits that don’t directly drive algal overgrowth. Organic or inorganic chemicals can affect water quality in various ways, but they aren’t the primary cause of the nutrient-driven blooms. Nitrate standards refer to limits set to protect water quality, not to the pollutant type that fuels algal growth.

Excess nutrients act as fertilizer for algae. Plant nutrients, especially nitrogen and phosphorus, enter water bodies from fertilizers, runoff, and waste. When these nutrients are abundant, algae and other phytoplankton can grow rapidly, causing blooms. This rapid growth can block light, alter habitat, and, when the algae die and decompose, deplete dissolved oxygen, leading to further ecological problems like dead zones. That direct link between nutrient input and algal growth makes plant nutrients the right answer.

Other options describe broader pollutant categories or regulatory limits that don’t directly drive algal overgrowth. Organic or inorganic chemicals can affect water quality in various ways, but they aren’t the primary cause of the nutrient-driven blooms. Nitrate standards refer to limits set to protect water quality, not to the pollutant type that fuels algal growth.