Which of the following retards the self purification of stream?
A. Higher temperature
B. Sunlight
C. Satisfying oxygen demand
D. None of the above
Answer: Option D
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1.) Because sunlight helps in self purification by killing pathogens.
2.) Also streams will get self - purified in less time at higher temperature.
3.) If the oxygen demand is satisfied, then stream becomes purified.
how
For the self cleaning of stream min discharge is required.
Which of the following retards the self purification of stream?