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] Phytoplankton populations 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) b, c
B) c, d
C) a, c
D) a, b
Correct Answer: C
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