Change set
Pick exam & year, then Go.
Question map
Not attempted
Correct
Incorrect
★
Bookmarked
Loading…
Q110
(UPPCS/2023)
Environment & Ecology › Pollution & Conservation
Biological Oxygen Demand (BOD) is a standard criteria for -
Result
Your answer:
—
·
Correct:
B
Explanation
Biological Oxygen Demand (BOD) is the amount of dissolved oxygen needed by aerobic biological organisms to break down organic material present in a water body. It is a standard pollution assay for aquatic ecosystems.
- High BOD indicates that there is a large amount of organic matter (such as sewage) in the water, requiring more oxygen for decomposition by microbes.
- As microbes consume oxygen to break down waste, the available dissolved oxygen for fish and other aquatic life decreases. Therefore, a higher BOD value signifies higher levels of water pollution.
- BOD is specifically used to assess water quality and is not a measure for oxygen in blood (Option A), atmospheric oxygen at high altitudes (Option C), or forest ecosystems (Option D).
How others answered
Each bar shows the % of students who chose that option.
Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
100%
got it right
✓ Thank you! We'll review this.