Acid rain causes

Options

A. Chlorosis
B. Increasing acidity of soil
C. Corroding bridges
D. All of these

Answer

### Step-by-Step Solution:

1. **Understanding Acid Rain**:
- Acid rain is formed when sulfur dioxide (SO2) and nitrogen oxides (NO and NO2) react with water vapor in the atmosphere, resulting in the formation of sulfuric acid and nitric acid.

2. **Effects on Plants (Chlorosis)**:
- When plants are exposed to acid rain, the pH level of their leaves decreases. This leads to chlorosis, which is characterized by yellowing of leaves due to the inability of plants to produce chlorophyll effectively. This condition can result in dehydration and reduced photosynthetic capacity in plants.

3. **Increasing Acidity of Soil**:
- Acid rain can also affect the soil. When acid rain seeps into the ground, it increases the acidity of the soil. This change in pH can negatively impact soil health, affecting nutrient availability and harming plant growth.

4. **Corrosion of Structures (Bridges)**:
- Acid rain can corrode metal structures, such as bridges. The acidic components in the rain react with the metals, leading to deterioration and weakening of the structures over time.

5. **Conclusion**:
- Given the effects discussed, acid rain causes:
- Chlorosis in plants
- Increased acidity of soil
- Corrosion of bridges and other metal structures
- Therefore, the correct answer is **D) All of these**.