Question

Algal bloom

• A. Causes deterioration of the water quality
• B. All of the above
• C. Causes fish mortality
• D. May be toxic to human beings and animals

Answer 1

The correct option is B All of the above

Algal bloom
An algal bloom is a rapid increase in the population of algae in an aquatic ecosystem because of excess nutrients.
It is highly invasive and forms dense mats all over the water bodies. Due to this it affects the water quality and decreases biodiversity.

Causes fish mortality
Algal bloom results in increasing the BOD (biochemical oxygen demand) of water. As the BOD increases the amount of dissolved oxygen depletes in the water body.
Depleted oxygen levels in a water body are responsible for the mortality of fishes.

May be toxic to human beings and animals
Some of the algal blooms are toxic to animals and human beings as it contaminates water and if this contaminated water is consumed, then it will affect their health.