Polysulphate estate are present in the cell wall of

Options

A. Ectocarpus and Dictyota
B. Gelidium and Polysiphonia.
C. Ectocarpus and Laminaria
D. Spirogyra and Chara

Answer

To solve the question regarding the presence of polysulphate esters in the cell wall of certain algae, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Key Term**: The question specifically asks about "polysulphate esters" and their presence in the cell wall of certain organisms.

2. **Understand the Types of Algae**: There are three main classes of algae:
- **Chlorophyceae** (Green Algae)
- **Rhodophyceae** (Red Algae)
- **Phaeophyceae** (Brown Algae)

3. **Analyze the Options**: The options provided are:
- Ectocarpus and Dictyota
- Gelidium and Polysiphonia
- Ectocarpus and Laminaria
- Spirogyra and Cara

4. **Determine the Composition of Cell Walls**:
- **Ectocarpus and Dictyota**: Both are brown algae; their cell walls are made of cellulose and algin, not polysulphate esters.
- **Gelidium and Polysiphonia**: Both are red algae; their cell walls contain polysulphate esters.
- **Ectocarpus and Laminaria**: Again, both are brown algae; their cell walls are made of cellulose and algin.
- **Spirogyra and Cara**: These are green algae; their cell walls are primarily made of cellulose.

5. **Identify the Correct Answer**: Since polysulphate esters are specifically found in the cell walls of red algae, the correct answer is **Gelidium and Polysiphonia**.

### Final Answer:
Polysulphate esters are present in the cell wall of **Gelidium and Polysiphonia**.

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