Home Biology Ecosystem Energy Flow and Food Chain The length of time needed for a lake to rega…
Biology Ecosystem Energy Flow and Food Chain Single Correct MCQ
Published on: August 14, 2026

The length of time needed for a lake to regain its pre-eutrophication conditions after nitrogen input is stopped depends on

A
the rate of turnover of its waters.
B
the presence of the appropriate algae-eating fish,
C
whether there is a thermocline in the lake.
D
the amount of groundwater reaching the lake.

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Verified by Experts
The correct answer is:
A

Recovery from eutrophication depends mainly on how quickly the lake water is replaced or mixed, which determines how fast excess nutrients are removed

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