Question : A lake near a village suffered heavy mortality of fishes within a few days.Consider the following reason for this i) Lots of urea and phosphate fertilzers were used in thecrops in the vicnity.II)The area was sprayed with DDT by an aircraft .The lake water turned green and stinky.Phytoplankton population in the lake decilend initially therby greatly reducing photosynthesis. whichtwo of the above were the main causes of fish mortality in the lake?

Question : A lake near a village suffered heavy mortality of fishes wi

1.	Question : A lake near a village suffered heavy mortality of fishes within a few days.Consider the following reason for this i) Lots of urea and phosphate fertilzers were used in thecrops in the vicnity.II)The area was sprayed with DDT by an aircraft .The lake water turned green and stinky.Phytoplankton population in the lake decilend initially therby greatly reducing photosynthesis. whichtwo of the above were the main causes of fish mortality in the lake?
Answer» II,III III,IV I,III I,Ii Answer :D