question_answer

Frequent occurrence of water blooms in a lake indicates [AIEEE 2003]

A) Nutrient deficiency

B) Oxygen deficiency

C) Excessive nutrient availability

D) Absence of herbivores in the lake

Correct Answer: B

Solution :

In polluted water nitrogen and phosphorous (from sewage) are accumulated which results in excessive growth of algae on water surface. Excessive growth of algae called water bloom. Due to death and decomposition of organic matter not available to aquatic animals.