Statement-1: Water is polluted by organic wastes
and
Statement-2: The amount of organic wastes is measured by the BOD.

Options

A. Statement-1: is True, Statement-2 is True, Statement-2 is a correct explanantion for Statement-1
B. Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-1
C. Statement:1 is True, Statement -2 is False
D. Statement-1 is False, Statement-2 is True

Answer

To analyze the given statements, we will break down each statement and evaluate their correctness and the relationship between them.

### Step 1: Evaluate Statement 1
**Statement 1:** Water is polluted by organic wastes.

- **Explanation:** Organic pollution occurs when organic materials, such as sewage, manure, or food waste, enter water bodies. This excess organic matter can lead to an increase in the population of decomposers (microorganisms) that break down these materials. As these decomposers thrive, they consume dissolved oxygen in the water, leading to a decrease in oxygen levels, which can harm aquatic life. Therefore, this statement is **true**.

### Step 2: Evaluate Statement 2
**Statement 2:** The amount of organic wastes is measured by the BOD.

- **Explanation:** BOD stands for Biochemical Oxygen Demand, which is a measure of the amount of oxygen that microorganisms will consume while decomposing organic matter in a water sample at a specified temperature over a set period (usually 5 days at 20°C). A higher BOD indicates a higher amount of organic waste present in the water, as more oxygen is required for decomposition. Thus, this statement is also **true**.

### Step 3: Determine the Relationship Between the Statements
- While both statements are true, we need to assess if Statement 2 correctly explains Statement 1.
- Statement 1 describes the phenomenon of water pollution due to organic waste, while Statement 2 provides a method of measuring the organic waste present in the water (BOD). However, Statement 2 does not explain why water is polluted; it only indicates how to quantify the organic waste.

### Conclusion
- Both statements are true, but Statement 2 does not serve as a correct explanation for Statement 1. Therefore, the answer is that both statements are true, but Statement 2 is not the correct explanation for Statement 1.

### Final Answer
**Both Statement 1 and Statement 2 are true, but Statement 2 is not the correct explanation for Statement 1.**

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