📊 Biology
Q. Why does a foul smell emanate from some ponds, tanks, etc. ?
  • (A) Pesticides and other organic chemicals reach the water body and kill off fishes, etc., living therein, causing the foul smell
  • (B) Fertilizers used in farming reach the water body and give rise to excessive growth of aqueous plants. When these plants die, excessive quantities of organic matter are collected, depleting dissolved oxygen and causing foul smell
  • (C) Household wastes contain small quantities of mercury, cadmium, copper, zinc, etc., which pollute the water bodies, causing the death of fishes and other aquatic organisms and leading to foul smell
  • (D) None of the above
✅ Correct Answer: (B) Fertilizers used in farming reach the water body and give rise to excessive growth of aqueous plants. When these plants die, excessive quantities of organic matter are collected, depleting dissolved oxygen and causing foul smell

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Brijesh Goswami
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