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 defined as the yellowing of leaf tissue in plants. This condition indicates that the plant is not able to produce enough chlorophyll, which is essential for photosynthesis.

2. **Identifying the Cause**:
- The primary cause of chlorosis is the deficiency of chlorophyll. Chlorophyll is the green pigment in plants that allows them to absorb sunlight and convert it into energy.

3. **Nutrient Deficiencies**:
- Chlorosis can be exacerbated by nutrient deficiencies, particularly of essential minerals. Key minerals that can lead to chlorosis when deficient include:
- **Manganese**
- **Zinc**
- These minerals are crucial for chlorophyll production and overall plant health.

4. **Environmental Factors**:
- Certain environmental factors can also contribute to chlorosis:
- **Poor drainage**: This can lead to waterlogged soils, which can inhibit root function and nutrient uptake.
- **High alkalinity**: Soils that are too alkaline can affect the availability of nutrients to the plant.
- **Pollution**: Specific pollutants like sulfur dioxide (SO2) and carbon monoxide (CO) can damage plant tissues and interfere with chlorophyll production.

5. **Conclusion**:
- In summary, chlorosis in plants is mainly caused by a lack of chlorophyll due to nutrient deficiencies (especially manganese and zinc), poor environmental conditions (like drainage and soil pH), and pollution (such as SO2).