Question

Eutrophication results in the reduction of

• A. Dissolved hydrogen
• B. Dissolved oxygen
• C. Mineral salts
• D. None of the above

Answer 1

Answer: (B)

Dissolved oxygen

Eutrophication is the phenomenon of nutrient enrichment (nitrogen, phosphorus) of a water body that initially supports a dense growth of plants and animal life. The extensive increase of algae growth in water bodies is called water bloom (algal bloom). Due to death of these algae, their organic matter gets decomposed, due to which oxygen gets depleted and the aquatic animals die.

Hence eutrophication results in the reduction of 'Dissolved oxygen'. So, the correct answer is 'Dissolved oxygen'.