A lake near a village suffered heavy mortality of fishes within a few days Consider the following reasons for this?
(a) Lots of urea and phosphate fertilizers were used in the crops in the vicinity.
(b) The area was sprayed with DDT by an aircraft.
(c) The lake water turned green and stinky.
(d) Phytoplankton population in the lake declined initially thereby greatly reducing photosynthesis. Which two of the above were the main causes of fish mortality in the lake?

A lake near a village suffered heavy mortality of fishes within a few day. Consider the following reasons for this?

A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this? a) Lots of urea and phosphate fertilizer were used in the crops in the vicinity b) The area was sprayed with DDT by an aircraft c) The lake water turned green and stinky d)Phvtoplankton populations in the lake declined initially thereby greatly reducing photosynthesis Which two of the above were the main causes of fish mortality in this lake?

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 an aircraft iii) The lake water turned green and stinky iv)Phytoplankton populations in the lake declined initially, thereby greatly reducing photosynthesis.

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 the crops 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. which two of the above were the main causes of fish mortality in the lake?

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 aircraft 3. The lake was turned green and stinky 4. Phytoplankton populations in the lake declined initially therby greatly reducing photosybthesis.

A lake near a village suffered heavy mortality of fishes within a few days. Which of the following statements could be the correct explanation for this ? (i) Lots of urea and phosphate fertillisers were used in the crops in the nearby fields. (ii) The croplands of the village were fertillised fields rich in nitrate and phosphate. (iii) The lake water turned green and stinky. (iv) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis.