Chlorosis in plants is mainly caused by

Options

A. CO pollution
B. Arsenic pollution
C. `SO_(2)` pollution
D. Soot particles

Answer

**Step-by-Step Solution:**

1. **Understanding Chlorosis**: Chlorosis is a condition in plants characterized by yellowing of leaf tissue. It is primarily caused by a deficiency of chlorophyll, the green pigment essential for photosynthesis.

2. **Identifying Causes of Chlorosis**: Several factors can lead to chlorosis, including:
- Poor drainage of soil
- High alkalinity of soil
- Deficiencies in essential nutrients like zinc and manganese
- Pollution, particularly from sulfur dioxide

3. **Analyzing the Options**: The question provides four options:
- Carbon monoxide pollution
- Arsenic pollution
- Sodium oxide pollution
- Shoot particle

4. **Evaluating the Options**:
- Carbon monoxide and arsenic pollution are not directly linked to chlorosis.
- Sodium oxide pollution does not typically cause chlorosis.
- Shoot particles are not a known cause of chlorosis.

5. **Identifying the Correct Answer**: Among the options, sulfur dioxide pollution is known to contribute to chlorosis by affecting the plant's ability to produce chlorophyll. Therefore, it is the correct answer.

6. **Conclusion**: The main cause of chlorosis in plants, as per the options provided, is sulfur dioxide pollution.

---