A) 2, 3
B) 3, 4
C) 1, 3
D) 1, 2
Correct Answer: D
Solution :
A lake near a village suffered heavy mortality of fishes within a few days, because lots of urea and phosphate fertilizer were used in the crops in the vicinity and the area was sprayed with DDT by an aircraft. Inorganic phosphorus and nitrogen are responsible for the growth of algae. In polluted water these increase due to which algae increase greatly at the surface of water forming water bloom. Due to death of these/algae their organic matter gets decomposed due to which oxygen gets depleted and aquatic animals die.
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