Question

Fertilizers added to fresh water will cause

• A. Death of plants
• B. Decrease in fish population
• C. Increase in aquatic animals
• D. Eutrophication

Answer 1

The correct option is D Eutrophication

Eutrophication is a process in which ageing of the lake occurs when it receives nutrients and sediments from the surrounding. The agricultural lands are the main cause of eutrophication of land because they contain the high concentration of fertilisers and minerals which are eventually washed away into lakes making it more fertile and shallow. A eutrophic lake sustains more living organisms because this nutrient acts as food for algae and fish. However, the excessive amount of nutrient in the lake are harmful to aquatic animals and cause depletion of oxygen dissolved in water and lake may change into the trophic state in the matter of decades.

Hence, the correct answer is 'Eutrophication'.