Q355
High biological oxygen demand indicates:
A.
absence of microbial pollution
B.
moderate microbial pollution
C.
intense level of microbial pollution
AnswerD.
all of these
Answer: Option C
Solution
Answer: Option C
Solution:
BOD indicates the amount of putrescible organic matter present in water. Therefore, a low BOD is an indicator of good quality water, while a high BOD indicates polluted water. Dissolved oxygen (DO) is consumed by bacteria when large amounts of organic matter from sewage or other discharges are present in the water.