Which of the following are the major contaminants from industries and households that cause cultural eutrophication?

Cultural eutrophication is the accelerated aging of a water body caused by human activities that introduce excessive nutrients into the ecosystem. The primary contaminants responsible for this process are nitrates and phosphates. These substances typically originate from household sewage, detergents, industrial effluents, and agricultural runoff.

When these nutrients enter lakes or rivers, they act as fertilizers, leading to the rapid growth of algae (algal blooms). The subsequent decomposition of this organic matter by aerobic bacteria depletes the dissolved oxygen in the water, creating hypoxic conditions that are fatal to fish and other aquatic organisms. While other nitrogenous compounds like ammonium can contribute, the combination of nitrates and phosphates is the most significant driver of cultural eutrophication globally.