___________ are very good pollution indicators

Options

A. Fungi
B. Bacteria
C. Lichens
D. Golden Algae

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for an organism or group of organisms that serve as good indicators of pollution.

2. **Analyzing the Options**: The options provided are fungi, bacteria, lichens, and golden alga. We need to evaluate which of these is known for indicating pollution levels.

3. **Evaluating Each Option**:
- **Fungi**: While fungi can be involved in various ecological processes, they are not specifically known as pollution indicators.
- **Bacteria**: Some bacteria can indicate pollution, but they are often the cause of pollution rather than indicators.
- **Lichens**: Lichens are a symbiotic relationship between fungi and algae. They are sensitive to air quality and do not thrive in polluted environments, making them excellent pollution indicators.
- **Golden Alga**: This organism is not specifically known for indicating pollution levels.

4. **Conclusion**: Based on the analysis, lichens are the best pollution indicators because they are sensitive to environmental changes and do not grow in polluted areas.

5. **Final Answer**: Lichens are very good pollution indicators.

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