In Ulothrix, the cell contains

Options

A. A chloroplast with many pyrenoids
B. A chloroplast with a few pyrenoids
C. A few chloroplasts with a few pyrenoids
D. Many chloroplasts with a few pyrenoids.

Answer

### Step-by-Step Solution:

1. **Identify the Organism**: The question refers to Ulothrix, which is a filamentous green alga.

2. **Understand the Structure of the Cell**: Each cell of Ulothrix contains a distinct nucleus and a large central vacuole.

3. **Examine the Chloroplast**: Ulothrix has a single large and thin chloroplast in each cell.

4. **Identify the Pyrenoids**: The chloroplast in Ulothrix contains a few pyrenoids. Specifically, there are about 13 pyrenoids associated with the chloroplast.

5. **Function of Pyrenoids**: The pyrenoids are responsible for starch storage within the chloroplast.

6. **Evaluate the Options**: Given the information, the correct answer is that Ulothrix has a chloroplast with a few pyrenoids.

7. **Select the Correct Answer**: Therefore, the correct option is **B: a chloroplast with a few pyrenoids**.