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What is B.O.D.:-...

What is B.O.D.:-

A

The amount of `O_2` utilised by organisms in water

B

The amount of `O_2` utilized by micro organisms for decomposition

C

The total amount of `O_2` present in water

D

All of the above

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The correct Answer is:
### Step-by-Step Solution 1. **Understanding BOD**: BOD stands for Biochemical Oxygen Demand. It is a measure of the amount of oxygen that microorganisms will consume while decomposing organic matter in water. 2. **Definition of BOD**: BOD specifically refers to the amount of dissolved oxygen required by aerobic organisms to break down organic material in a water sample. This process is crucial for assessing the level of pollution in water bodies. 3. **Analyzing the Options**: - **Option A**: "The amount of O2 utilized by organisms in water" - This is too broad and does not specifically refer to the decomposition of organic matter. - **Option B**: "The amount of O2 utilized by microorganisms for decomposition" - This is correct as it specifically mentions microorganisms and their role in decomposing organic material. - **Option C**: "The total amount of O2 present in water" - This is incorrect as BOD does not measure the total oxygen available but rather the oxygen demand for decomposition. 4. **Conclusion**: The correct interpretation of BOD is that it is the amount of oxygen utilized by microorganisms for the decomposition of organic material in water. ### Final Answer BOD (Biochemical Oxygen Demand) is the amount of oxygen utilized by microorganisms for decomposition. ---
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