The vegetative cells have a cellulosic wall usualy covered on the outside by a gelatinous coating of non-sulphated hydrocolloids in

Options

A. Dictyota and Laminaria
B. Sargassum and Ulothrix
C. Chara and Chlamydomonas
D. Fucus and Polysiphonia

Answer

To answer the question regarding which group of algae has vegetative cells with a cellulosic wall usually covered by a gelatinous coating of non-sulfated hydrocolloids, we can follow these steps:

### Step-by-step Solution:

1. **Identify the Characteristics of the Algae**:
- The question mentions vegetative cells with a cellulosic wall and a gelatinous coating of non-sulfated hydrocolloids.

2. **Classify the Types of Algae**:
- Algae can be classified into three main classes based on their color and characteristics:
- **Chlorophyceae** (Green Algae)
- **Rhodophyceae** (Red Algae)
- **Phaeophyceae** (Brown Algae)

3. **Analyze the Cell Wall Composition**:
- In brown algae (Phaeophyceae), the vegetative cells have a cellulosic wall that is often covered by a gelatinous coating. This is a distinguishing feature of this group.

4. **Examples of Algae**:
- The transcript mentions specific examples of algae:
- **Brown Algae**: Dictyota, Laminaria, Sargassum, and Fucus.
- **Green Algae**: Chara and Chlamydomonas.
- **Red Algae**: Polysiphonia.

5. **Determine the Correct Group**:
- Based on the information, the algae that fit the description of having a cellulosic wall covered by a gelatinous coating of non-sulfated hydrocolloids are the brown algae (Phaeophyceae), specifically examples like Dictyota and Laminaria.

6. **Conclusion**:
- Therefore, the correct answer is that the vegetative cells with a cellulosic wall usually covered by a gelatinous coating of non-sulfated hydrocolloids are found in **Brown Algae**.

### Final Answer:
The vegetative cells have a cellulosic wall usually covered on the outside by a gelatinous coating of non-sulfated hydrocolloids in **Brown Algae** (Phaeophyceae).

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