`SO_(2)` pollution is indicated by destruction of

Options

A. Climbers
B. Lichens
C. Mosses
D. Grasses.

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about what type of pollution, specifically sulfur dioxide (SO₂) pollution, is indicated by the destruction of certain organisms.

2. **Analyzing the Options**: The options provided are climbers, lichens, mosses, and grasses. We need to evaluate each option to determine which one is most affected by SO₂ pollution.

3. **Evaluating Climbers**: Climbers are animals that can climb. They are not directly affected by SO₂ pollution, so this option is incorrect.

4. **Evaluating Lichens**: Lichens are a symbiotic relationship between fungi and algae. They are known to be sensitive to air pollution, particularly SO₂. The presence of lichens indicates a clean environment, while their absence suggests pollution. Therefore, this option is likely correct.

5. **Evaluating Mosses**: Mosses are small, non-vascular plants. While they can be affected by environmental changes, they are not specifically known to be indicators of SO₂ pollution. Thus, this option is incorrect.

6. **Evaluating Grasses**: Grasses are adaptable plants found in various environments. Like mosses, they are not specifically sensitive to SO₂ pollution, making this option incorrect as well.

7. **Conclusion**: Based on the evaluations, the correct answer is that SO₂ pollution is indicated by the destruction of lichens.

### Final Answer:
SO₂ pollution is indicated by the destruction of lichens.

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