What is the reason for the reduction in dissolved oxygen?

Category: QuestionsWhat is the reason for the reduction in dissolved oxygen?
Editor">Editor Staff asked 4 weeks ago

What is the reason for the reduction in dissolved oxygen?
 
(a) Bio-magnification
 
(b) Eutrophication
 
(c) Extinction
 
(d) Pollution
 
The question was asked in semester exam.
 
I need to ask this question from Environmental Issues topic in section Environmental Issues of Biology – Class 12

1 Answers
Editor">Editor Staff answered 4 weeks ago

Correct option is (b) Eutrophication
 
Explanation: The excessive richness of nutrients (phosphorus, nitrates, and detergents) in a lake or other body of water that leads to acceleration in the growth of algae and the natural aging of the lake is known as eutrophication. Excess algal growth deoxygenates water and reduces the dissolved oxygen content.