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Concept of BOD

What is repre...

Question

What is represented by letter A, B and C?

A

A- oxygen, B- organic matter, C- BOD

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B

A- BOD, B- organic matter, C- oxygen

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C

A- organic matter, B- BOD, C- oxygen

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D

A- dissolved oxygen, B- BOD, C- organic matter

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Solution

The correct option is D A- dissolved oxygen, B- BOD, C- organic matter
A figure shows changes that one may notice following discharge of sewage into a river.
Micro-organisms involved in biodegradation of organic matter in the receiving water body by consuming a lot of oxygen, and as a result, there is a sharp decline in dissolved oxygen downstream from the point of sewage discharge. This causes mortality of fish and other aquatic creatures. Thus, the correct answer is option D.

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Q. Statement 1 : BOD represents the amount of dissolved oxygen that would be consumed if all the organic matter in one litre of water were oxidised by microorganisms.
Statement 2 : High value of BOD indicates that water is highly polluted by organic matter.

Q. Read the following statements (A-D) related to Biochemical Oxygen Demand (BOD) and identify the correct option stating true (T) and false (F).

A. Biochemical oxygen demand is defined as the amount of dissolved oxygen needed by microorganisms in decomposing the inorganic wastes.
B. Greater the BOD of waste water, the higher is the amount of organic matter present.
C. The BOD increases with time as organic matter gets decomposed.
D. Sewage water is treated till the BOD is reduced

Q. Assertion :Amount of biodegradable present in water is measured by BOD organic matter. Reason: During biodegradation of organic compounds, oxygen is released.

Q. Assertion :Amount of biodegradable organic matter present in water is measured by BOD of water. Reason: During biodegradation of organic compounds, oxygen is released.

Q. Biochemical Oxygen Demand(BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct?

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