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 solve the question regarding the vegetative cells that have a cellulosic wall usually covered on the outside by a gelatinous coating of non-sulfated hydrocolloids, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Type of Organism**: The question refers to vegetative cells with a cellulosic wall and a gelatinous coating. This description is characteristic of certain algae.

2. **Classify the Algae**: Algae are classified into three main classes:
- **Chlorophyceae** (Green algae)
- **Rhodophyceae** (Red algae)
- **Phaeophyceae** (Brown algae)

3. **Focus on Brown Algae**: Since the question mentions a gelatinous coating, we should focus on the Phaeophyceae class, which includes brown algae. Brown algae typically have a cellulosic wall that is covered by a gelatinous substance.

4. **Identify the Gelatinous Coating**: The gelatinous coating found on the cell walls of brown algae is primarily composed of algin, which is a non-sulfated hydrocolloid.

5. **Examples of Brown Algae**: Common examples of brown algae include:
- **Ectocarpus**
- **Laminaria**
- **Fucus**
- **Sargassum**

6. **Evaluate the Options**: Now, we need to evaluate the provided options based on the examples of brown algae:
- **Option 1**: Teota and Laminaria (Laminaria is a brown algae)
- **Option 2**: Sargassum and Eulothrix (Sargassum is a brown algae, Eulothrix is green)
- **Option 3**: Chara and Chlamydomonas (Both are green algae)
- **Option 4**: Fucus and Polysiphonia (Fucus is brown algae, Polysiphonia is red algae)

7. **Select the Correct Option**: The correct option is **Option 1**: Teota and Laminaria, as Laminaria is a brown algae with the characteristics mentioned in the question.

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

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