Question

The signs of eutrophication of water bodies include

• A. Reduced oxygen demand
• B. Rapid decomposition of organic matter
• C. Algal bloom
• D. Fluorosis

Answer 1

The correct option is C Algal bloom

Eutrophication is the natural aging of a lake by nutrient enrichment of its water. With time, streams draining into the lake introduce nutrients such as nitrogen and phosphorus, which encourage the growth of aquatic organisms.

As the lake's fertility increases, algal bloom occurs. Algal bloom causes the deterioration of water quality and fish mortality and dead remains begin to be deposited on the lake bottom. Over the year, the lake is finally converted into the land.