Biological oxygen demand (BOD) is a standard criterion for :

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Q: 3 (IES/2014)
Biological oxygen demand (BOD) is a standard criterion for :

question_subject: 

Science

question_exam: 

IES

stats: 

0,87,26,12,10,87,4

keywords: 

{'biological oxygen demand': [0, 0, 0, 3], 'oxygen levels': [0, 0, 0, 2], 'computing oxygen levels': [0, 0, 0, 2], 'bod': [1, 0, 0, 3], 'pollution': [3, 0, 1, 0], 'aquatic systems': [0, 0, 0, 1], 'forest ecosystems': [0, 0, 0, 2], 'high altitude regions': [0, 0, 0, 2], 'blood': [5, 0, 0, 1], 'standard criterion': [0, 0, 0, 1]}

The correct answer is option 3: Pollution assay in aquatic systems.

Biological oxygen demand (BOD) is a measure of the amount of oxygen that is consumed by microorganisms in a body of water. It is used as a standard criterion to assess the degree of pollution in aquatic systems. When organic matter, such as sewage or industrial waste, is discharged into water bodies, it serves as a food source for microorganisms. These microorganisms consume oxygen as they break down the organic matter, leading to a decrease in the available oxygen levels in the water.

By measuring the BOD, scientists can determine the amount of organic pollution present in the water. Higher BOD values indicate a greater degree of pollution, while lower values indicate cleaner water. This information is essential in evaluating the health of aquatic ecosystems and determining the effectiveness of pollution control measures.

To summarize, BOD is not used for measuring oxygen levels in blood (option 1), computing oxygen levels in forest ecosystems (option 2), or assessing oxygen levels in high altitude regions (option 4). It is specifically used as a tool for assessing pollution in aquatic systems.