The high biological oxygen demand that accompanies algal bloom in eutrophic lakes increases the span of the ________ zone.
A) oxygenic epilimnion
B) anoxic hypolimnion
C) coastal shelf
D) anoxic benthic
E) oxygenic neuston

Question

Quizplus · Accepted Answer

Algal bloom in eutrophic lakes can result in a high biological oxygen demand, as the algae decompose and consume oxygen. This can lead to anoxia (absence of oxygen) in the hypolimnion, the lower layer of the lake that is cut off from the oxygen-rich epilimnion by a thermocline. Therefore, the span of the anoxic hypolimnion zone increases due to the increased biological oxygen demand.

The High Biological Oxygen Demand That Accompanies Algal Bloom in Eutrophic