Clean water should have BOD of 17 ppm or more.(T/F)

Answer

To determine whether the statement "Clean water should have BOD of 17 ppm or more" is true or false, we can follow these steps:

### Step 1: Understand BOD
BOD stands for Biochemical Oxygen Demand. It measures the amount of oxygen consumed by microorganisms while decomposing organic matter in water under aerobic conditions.

**Hint:** Remember that BOD is an indicator of water quality, specifically the level of organic pollution.

### Step 2: Identify BOD levels for clean water
According to established standards, clean water typically has a BOD of around 5 ppm (parts per million).

**Hint:** Look for standard values of BOD for different types of water to understand what is considered clean.

### Step 3: Compare with the statement
The statement claims that clean water should have a BOD of 17 ppm or more. Since we know that clean water has a BOD of 5 ppm, this statement is incorrect.

**Hint:** Compare the given BOD value in the statement with the known BOD value for clean water.

### Step 4: Conclusion
Since the BOD of clean water is 5 ppm, and the statement suggests it should be 17 ppm or more, the statement is false.

**Final Answer:** False.

### Summary of Steps:
1. Understand what BOD is.
2. Identify the BOD level for clean water.
3. Compare the statement with known values.
4. Conclude whether the statement is true or false.