High biological oxygen demand in a water body means ……….

Options

A. water is not polluted
B. water is less polluted
C. water body contains lots of life forms and organic pollutant.
D. None of the above

Answer

To solve the question regarding the implications of high biological oxygen demand (BOD) in a water body, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding BOD**:
- Biological Oxygen Demand (BOD) is a measure of the amount of oxygen that microorganisms will consume while decomposing organic matter in water. A higher BOD indicates that more oxygen is being consumed by these microorganisms.

**Hint**: Remember that BOD reflects the oxygen consumption by bacteria and fungi during the decomposition of organic materials.

2. **Interpreting High BOD**:
- When BOD is high, it means that there is a significant amount of organic matter present in the water. This organic matter serves as food for microorganisms, which leads to increased oxygen consumption.

**Hint**: Think about what happens when there's more food (organic matter) available for microorganisms.

3. **Consequences of High BOD**:
- As microorganisms decompose the organic matter, they use up the dissolved oxygen in the water. This can lead to lower levels of dissolved oxygen, which is crucial for the survival of aquatic organisms.

**Hint**: Consider the impact on aquatic life when oxygen levels drop due to high consumption by microorganisms.

4. **Evaluating the Options**:
- Given the options:
- Water is not polluted
- Water is less polluted
- Water body contains lots of life forms and organic pollutants
- None of the above
- Since a high BOD indicates a high level of organic pollutants and suggests that the water is heavily polluted, the correct answer is that the water body contains lots of life forms and organic pollutants.

**Hint**: Focus on the relationship between BOD and pollution levels to choose the correct option.

### Final Answer:
High biological oxygen demand in a water body means that the water body contains lots of life forms and organic pollutants.