Microbes In Human Welfare Question 14
Question: The amount of oxygen required by the microbes in the decomposition of organic matter is called:
Options:
A) Chemical oxygen demand
B) Biochemical oxygen demand
C) Total oxygen demand
D) Dissolved oxygen
Show Answer
Answer:
Correct Answer: B
Solution:
Option B, Biochemical Oxygen Demand, is the correct answer. BOD is a measure of the quantity of oxygen used by microorganisms (e.g., aerobic bacteria) in the oxidation of organic matter.
When there are lots of organic materials present in water, bacteria multiply and use up the oxygen in water.
The BOD test measures the rate of uptake of oxygen by micro-organisms in a sample of water in the dark at 20°C over a period of 5 days.
BETA
