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

Options

A. If both are true with reason being correct explanation
B. Both are true but reason is not correct explanation
C. assertion is true but reason is wrong
D. both are wrong

Answer

To solve the assertion and reason question, we will analyze both statements step by step.

### Step 1: Analyze the Assertion
The assertion states: "Amount of biodegradable organic matter present in water is measured by BOD of water."

- **Explanation**: 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. A higher BOD indicates a higher amount of biodegradable organic material present in the water.

- **Conclusion**: The assertion is **true** because BOD is indeed used to quantify the amount of biodegradable organic matter in water.

### Step 2: Analyze the Reason
The reason states: "During biodegradation of organic compounds, oxygen is released."

- **Explanation**: During the biodegradation process, microorganisms break down organic matter. This process primarily consumes oxygen and produces carbon dioxide as a byproduct. Therefore, oxygen is not released; instead, it is utilized in the breakdown process.

- **Conclusion**: The reason is **false** because it incorrectly states that oxygen is released during biodegradation.

### Step 3: Determine the Relationship Between Assertion and Reason
Now, we need to evaluate the relationship between the assertion and the reason:

- The assertion is true, but the reason is false. Therefore, the correct conclusion is that the assertion is true, but the reason does not correctly explain the assertion.

### Final Answer
The correct answer is that the assertion is true, but the reason is false.

---