Which one of the following statements is correct?

Explanation

Eutrophication is the excessive growth of algae, plants, and animals in water bodies due to nutrient enrichment, particularly with nitrogen and phosphate. Nutrients present in sewage, agricultural wastes, and fertilizers cause dense growth of plants and planktonic algae. The excessive growth of planktonic algae that causes the coloration of water is called algal bloom, which is toxic to animals and humans. Eutrophic water bodies also support the excessive growth of floating plants. Algal blooms and floating plants cut off light form submerged plants, resulting in their death. There is drastic decrease in oxygen replenishment inside water. Non­-availability of oxygen results in the death of aquatic animals such as fish, which further adds to organic loading of water. Decomposition is replaced by putrefaction which is anaerobic, leading to an absence of oxygen in water and the death of aquatic animals.