Question : A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this : 1. Lots of urea and phosphate fertilize were used in the crops in the vicinity 2 The area was spreyed with DDT by an aircraft3. The lake was turned green and stinky 4. Phytoplankton populations in the lake declined initially therby greatly reducing photosybthesis.

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 reasons for this : 1. Lots of urea and phosphate fertilize were used in the crops in the vicinity 2 The area was spreyed with DDT by an aircraft3. The lake was turned green and stinky 4. Phytoplankton populations in the lake declined initially therby greatly reducing photosybthesis.
Answer» 1 and 2 2 and 3 3 and 4 1 and 3 Answer :B