Question

Lake are overnourished by nutrients N and P​

Answer 1

Eutrophication (from Greek eutrophos, "well-nourished"),[1] dystrophication or hypertrophication, is when a body of water becomes overly enriched with minerals and nutrients which induce excessive growth of algae.[2] This process may result in oxygen depletion of the water body after the bacterial degradation of the algae.[3] One example is an "algal bloom" or great increase of phytoplankton in a pond, lake, river or coastal zone as a response to increased levels of nutrients. Eutrophication is often induced by the discharge of nitrate or phosphate-containing detergents, fertilizers, or sewage into an aquatic system. Lake eutrophication has become a global problem of water pollution. Chlorophyll-a, total nitrogen, total phosphorus, biological or chemical oxygen demand and secchi depth are the main indicators to evaluate lake eutrophication level.[4] Target 14.1 of Sustainable development goal 14 preventing all kinds of marine pollution including nutrient pollution which is eutrophication.[5]

The eutrophication of the Potomac River is evident from the bright green water, caused by a dense bloom of cyanobacteria.

Eutrophication in a canal

Answer 2

Lake is overnourished by nutrients N and P due to Eutrophication.

• Eutrophication is a term that refers to nutrient contamination, which is what causes algal blooms. When the amount of nitrogen and phosphorus in the water increases as a result of human activity, this is known as eutrophication.
• This nitrogen and phosphorus can come from a variety of sources, including fertilisers that are sprayed to the land and washed into rivers when it rains, sewage and other waste that is pumped into waterways after treatment and increasing soil erosion caused by farming and land clearing.