Question

Biological oxygen demand (BOD) is a standard criterion for

• A. Measuring oxygen levels in blood
• B. Computing oxygen levels in forest ecosystems
• C. Pollution assay in aquatic ecosystems
• D. Assessing oxygen levels in high altitude regions

Answer 1

The correct option is C

Pollution assay in aquatic ecosystems

The correct option is C:
Explanation of correct option-

1. The amount of oxygen needed by biological organisms such as bacteria in a given water sample for a breakdown of organic matter by oxidation process is called the Biochemical Oxygen Demand.
2. BOD is often used in wastewater treatment plants and is used as an index of the degree of organic pollution in water.

Explanation of incorrect option-

Option A-

1. Measurement of oxygen levels in the blood is done by a pulse oximeter.
2. This device is able to determine the percentage of oxygen in the blood by using a cold light source.

Option B-

Oxygen levels in forest ecosystems can be measured by Audus apparatus or by counting the bubbles evolved from the pondweed.

Option D-

Oxygen levels in high-altitude regions cab are assessed by oxygen meter.

Final answer: Biological oxygen demand (BOD) is a standard criterion for Pollution assay in aquatic ecosystems