Sulphur dioxide pollution is indicated by

Options

A. Deschampsia (grasses)
B. Sphagnum (mosses)
C. Usnea (lichens)
D. Cucurbits (climbers)

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the indicators of sulfur dioxide pollution. We need to identify which organisms or indicators are associated with the presence of sulfur dioxide in the environment.

2. **Analyzing the Options**: The options provided are:
- A. Dismantia (grasses)
- B. Spagnum (mosses)
- C. Asniya (lichens)
- D. Kukurbits (cucumbers)

3. **Evaluating Each Option**:
- **Dismantia (Grasses)**: These are not indicators of air pollution, specifically sulfur dioxide. They do not respond to sulfur dioxide levels.
- **Spagnum (Mosses)**: While they can indicate air pollution, they are more associated with nitrogen pollution rather than sulfur dioxide. Their growth is linked to increased nitrogen levels in the air.
- **Asniya (Lichens)**: Lichens are known to be sensitive to sulfur dioxide levels. They thrive in environments where sulfur dioxide is present, making them strong indicators of sulfur dioxide pollution.
- **Kukurbits (Cucumbers)**: These are not indicators of air pollution and do not relate to sulfur dioxide levels.

4. **Conclusion**: Based on the evaluation, the correct answer is **C. Asniya (lichens)**, as they are the organisms that indicate the presence of sulfur dioxide pollution in the environment.

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