A pteridophyte having pyrenoid in its chloroplasts is

Options

A. Pteridium
B. Selaginella
C. Equisetum
D. Marsilea.

Answer

To solve the question "A pteridophyte having pyrenoid in its chloroplasts is," we can follow these steps:

### Step 1: Understand the Terms
- **Pteridophyte**: This is a group of vascular plants that reproduce via spores and do not produce seeds. Examples include ferns, horsetails, and clubmosses.
- **Pyrenoid**: This is a structure found within the chloroplasts of certain algae and some plants, which is involved in the storage of starch and the fixation of carbon dioxide during photosynthesis.

### Step 2: Identify the Function of Pyrenoids
- Pyrenoids are primarily associated with the synthesis and storage of carbohydrates and contain the enzyme Rubisco, which is essential for the process of carbon fixation.

### Step 3: Analyze the Options
- The question implies that we need to identify a specific pteridophyte that contains pyrenoids in its chloroplasts.
- The options provided are likely different types of pteridophytes.

### Step 4: Evaluate Each Option
1. **Pteridium**: Commonly known as bracken fern, it does not have pyrenoids in its chloroplasts.
2. **Salvinia**: This is a genus of water ferns that does have pyrenoids in its chloroplasts, making it a potential correct answer.
3. **Equisetum**: Known as horsetails, these do not have pyrenoids.
4. **Marsilea**: This is a genus of water ferns, but it does not contain pyrenoids.

### Step 5: Conclusion
- Based on the analysis, the correct answer to the question is **Salvinia** (option number two), as it is the only pteridophyte listed that contains pyrenoids in its chloroplasts.

### Final Answer
The pteridophyte having pyrenoid in its chloroplasts is **Salvinia**.

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