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30/10/2021 5:43 pm
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A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this?
(1) The lake water turned green and stinky
(2) Lots of urea and phosphate fertilizer were used in the crops in the vicinity
(3) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.
Which two of the above were the main causes of fish mortality in the lake?
(4) The area was sprayed with DDT by an aircraft
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30/10/2021 5:43 pm
Correct answer: (1) The lake water turned green and stinky