A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this?
(i) Lots of urea and phosphate fertilizer were used in the crops in the vicinity
(ii) The area was sprayed with DDT by and aircraft
(iii) The lake water turned green and stinky
(iv) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.
Which two of the above were the main cause of fish mortality in the lake ?
Text Solution
Verified by ExpertsA
Excess urea and phosphate fertilizers entering the lake cause eutrophication, leading to algal blooms. The water turning green and stinky indicates oxygen depletion, which results in fish mortality.
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