A lake near a village suffered heavy mortality of fishes within a few days. Which of the following can be the reason for this? (a) Lots of urea and phosphate fertilizer were used in the crops in the v

Question

A lake near a village suffered heavy mortality of fishes within a few days. Which of the following can be the reason 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) Phytoplankton population in the lake declined initially thereby greatly reducing photosynthesis.

TestHub · Accepted Answer

Lots of urea and phosphate fertilizer were used in the crops in the vicinity and the lake water turned green and stinky. Due to this, the lake near a village suffered heavy mortality of fishes within a few days.

Botany - Environmental Issues Question with Solution | TestHub

Options:

Doubts & Discussion