Question

Biochemical oxygen demand (BOD) may not be a good index of pollution for water bodies receiving effluents from:
a) domestic sewage
b) dairy industry
c) petroleum industry
d) sugar industry

Answer 1

Answer:

C) Petroleum industry Because from there non biodegradable wastes will be added so there will not be any act of organisms to break them.

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Answer 2

BOD is increased by dumping off waste rich in phosphates and nitrogen compounds as these two favor algal growth causing algal bloom and death of other underwater plants due to lack of Sunlight. The presence of excess organic matter favors microbial growth and reduces available dissolved oxygen. Petroleum industry waste is rich in radium-based toxic substances that do not favor algal and plankton growth and no effect on BOD. correct ans is C.