Biological Oxygen Demand (BOD) is a standard criterion fora)Measuring oxygen levels in bloodb)Computing oxygen levels in forest ecosystemsc)Pollution assay in aquatic ecosystemsd)Assessing oxygen levels in high altitude regionsCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Yeah...it is measurement of pollution or pollutants in the aquatic environment...

Answer

Biological Oxygen Demand is defined as the amount of dissolved oxygen required by aerobic microorganisms to breakdown the organic materials in a sample of water.

Water pollution by organic wastes is measured in terms of Biochemical Oxygen Demand (BOD).

The higher value of BOD indicates low Dissolved Oxygen (DO) content of water.

Answer

< b='' />Introduction:
Biological Oxygen Demand (BOD) is a measure used to assess the level of pollution in aquatic ecosystems. It indicates the amount of dissolved oxygen required by aerobic microorganisms to break down organic matter present in the water.

< b='' />Explanation:
BOD is an important criterion used in pollution assays in aquatic ecosystems. It provides valuable information about the quality of water and the level of pollution present in it. The higher the BOD value, the greater the pollution level and the lower the water quality.

< b='' />Significance:
BOD is used to determine the impact of organic pollutants on water bodies. It helps in assessing the pollution caused by various sources such as domestic sewage, industrial effluents, agricultural runoff, and urban runoff. By measuring BOD, scientists and environmentalists can understand the health of aquatic ecosystems and take necessary actions for their preservation and restoration.

< b='' />Procedure:
To measure BOD, water samples are collected from the aquatic ecosystem and incubated in a dark bottle for a specific period, typically five days. During this incubation period, aerobic microorganisms present in the water utilize the dissolved oxygen to break down the organic matter. The decrease in dissolved oxygen concentration is measured at the beginning and end of the incubation period. The difference between the initial and final dissolved oxygen concentrations gives the BOD value.

< b='' />Interpretation:
A low BOD value indicates clean and unpolluted water, as the organic matter present in the water is easily decomposed by microorganisms, resulting in a minimal decrease in dissolved oxygen concentration. On the other hand, a high BOD value indicates polluted water, as the organic matter present requires more oxygen for decomposition, resulting in a significant decrease in dissolved oxygen concentration.

< b='' />Conclusion:
In conclusion, Biological Oxygen Demand (BOD) is a standard criterion used for pollution assays in aquatic ecosystems. It helps in assessing the pollution level in water bodies and plays a crucial role in understanding the health of aquatic ecosystems. By measuring BOD, scientists can identify sources of pollution and take necessary actions for the conservation and restoration of aquatic ecosystems.

Answer

Biological oxygen demand (BOD) is the amount of dissolved oxygen needed (i. e., demanded) by aerobic micro organisms to break down organic material present in a given water sample. A highly polluted water will have a high levels of biological oxygen demand (BOD).

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Biological Oxygen Demand (BOD) is a standard criterion for

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