Which among the following is / are consequences, when an aquatic ecosystem such as a lake experiences an increase in nutrients?
1. The Population of most species of fish will increase
2. The Biological Oxygen Demand of the lake water would decrease
3. The biomass of phytoplankton will increase
Choose the correct option from the codes given below:

Answer: [B] Only 3

Ecological Impacts of Eutrophication:

§  Increased biomass of phytoplankton, This increases Biological Oxygen Demand

§  Toxic or inedible phytoplankton species

§  Increases in blooms of gelatinous zooplankton

§  Increased biomass of benthic and epiphytic algae

§  Changes in macrophyte species composition and biomass

§  Decreases in water transparency (increased turbidity)

§  Colour, smell, and water treatment problems

§  Dissolved oxygen depletion, this leads to increase in Biological Oxygen Demand

§  Increased incidences of fish kills

§  Loss of desirable fish species

§  Reductions in harvestable fish and shellfish

§  Decreases in perceived aesthetic value of the water body

This question is a part of GKToday's Integrated IAS General Studies Module