NEET 2009
- Exam
- NEET
- Year
- 2009
- Subject
- Zoology
- Chapter
- Microbes in Human Welfare
NEET 2009 · Zoology · Microbes in Human Welfare
Biochemical Oxygen Demand (BOD) in a river water
Biochemical Oxygen Demand (BOD) in a river water
Options
- Aremains unchanged when algal bloom occurs
- Bhas no relationship with concentration of oxygen in the water
- Cgives a measure of Salmonetla in the water
- Dincreases when sewage gets mixed with river water
Correct answer
D. increases when sewage gets mixed with river water
Step-by-step solution
Biochemical Oxygen Demand (BOD) is the amount of oxygen used for biochemical oxidation by micro-organisms in a unit volume of water. Polluted water has high BOD. Thus, when sewage gets mixed with river water, BOD will increase.