Which one of the following affects chlorophyll?

Options

A. Sulphur dioxide
B. Nitrogen oxides
C. Carbon monoxide
D. Both (1) & (2)

Answer

To solve the question "Which one of the following affects chlorophyll?" we need to analyze the options provided and understand how each of them interacts with chlorophyll.

### Step-by-Step Solution:

1. **Identify the Options**: The options given are:
- A) Sulfur Dioxide
- B) Nitrogen Oxides
- C) Carbon Monoxide
- D) Both A and B

2. **Understand the Role of Chlorophyll**: Chlorophyll is a green pigment found in plants that is essential for photosynthesis. It captures light energy to convert carbon dioxide and water into glucose and oxygen.

3. **Research the Effects of Each Option**:
- **Sulfur Dioxide (SO2)**: This gas is known to be phytotoxic, meaning it can harm plants. It disrupts the chloroplast membrane, which can lead to a decrease in chlorophyll content. The breakdown of chlorophyll can occur due to secondary processes triggered by SO2.
- **Nitrogen Oxides (NOx)**: While nitrogen oxides can have harmful effects on plants, their direct impact on chlorophyll is less pronounced compared to sulfur dioxide.
- **Carbon Monoxide (CO)**: This gas is primarily known for its effects on human health and does not have a significant direct impact on chlorophyll.
- **Both A and B**: This option suggests that both sulfur dioxide and nitrogen oxides affect chlorophyll, but based on the information, sulfur dioxide is the primary concern.

4. **Conclusion**: Based on the analysis, sulfur dioxide is the most significant pollutant affecting chlorophyll due to its phytotoxic nature and its ability to disrupt the chloroplast membrane.

### Final Answer:
The correct option is **A) Sulfur Dioxide**.