Some effect of sulphur dioxide and its transformation products on plant include:

Answer

### Step-by-Step Solution:

1. **Absorption of Sulphur Dioxide**:
- Plants absorb sulphur dioxide (SO2) through their stomata, which are small openings on the leaves that facilitate gas exchange.

2. **Formation of Sulfuric Acid**:
- Once inside the plant, sulphur dioxide reacts with water (H2O) present in the plant tissues to form sulfuric acid (H2SO4). This reaction can lead to a decrease in pH, making the environment more acidic.

3. **Tissue Damage**:
- The formation of sulfuric acid can cause extensive tissue damage in plants. This is because the acid can disrupt cellular functions and lead to necrosis (death of plant tissues).

4. **Impact on Chlorophyll**:
- Sulphur dioxide can lead to the breakdown of chlorophyll molecules, which are essential for photosynthesis. The presence of SO2 can result in the loss of magnesium ions (Mg2+) from chlorophyll, leading to its degradation.

5. **Decrease in Photosynthesis**:
- With the destruction of chlorophyll, the plant's ability to perform photosynthesis is significantly reduced. This means that the plant cannot effectively convert sunlight into energy, leading to stunted growth and reduced vitality.

6. **Transformation of Chlorophyll**:
- The sulphur dioxide is responsible for transforming chlorophyll a into pheophytin, a non-photosynthetic pigment, which further indicates the detrimental effects of SO2 on plant health.

### Final Answer:
The effects of sulphur dioxide and its transformation products on plants include:
- Chlorophyll destruction
- Extensive tissue damage
- Decrease in photosynthesis efficiency

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