Tracheids are type of water-conducting cell in the xylem which lacks perforations in the cell wall found in all the following plants , except

Options

A. a flowerless green plant of the division Pteridophyte, which comprises the ferns and their relatives
B. a plant of a group that comprises those that have seeds unprotected by an ovary or fruit, including the conifers, cycads, and ginkgo.
C. a small flowerless green plant of the division Bryophyta, which comprises the mosses and liverworts.
D. a plant of a large group that comprises those that have flowers and produce seeds enclosed within a carpel

Answer

To solve the question, we need to identify which of the given plant groups does not contain tracheids, which are specialized water-conducting cells found in the xylem.

### Step-by-Step Solution:

1. **Understand Tracheids**: Tracheids are elongated cells in the xylem that facilitate water conduction. They are characterized by the absence of perforations in their cell walls.

2. **Identify Plant Groups**: We need to analyze the options provided to determine which plant group does not contain tracheids.

3. **Evaluate Each Option**:
- **Option 1**: Refers to a flowerless green plant of the division Tracheophyta, which includes ferns and their relatives. Ferns are vascular plants and do contain tracheids.
- **Option 2**: Refers to a group of plants that have seeds unprotected by the ovary or fruit, including conifers, cycads, and ginkgos. These are gymnosperms, which also possess tracheids in their xylem.
- **Option 3**: Refers to a small flowerless green plant of the division Bryophyta, which includes mosses and liverworts. Bryophytes are non-vascular plants and do not have tracheids; they rely on diffusion for water transport.
- **Option 4**: Refers to a large group of plants that produce flowers and seeds enclosed within a carpel, which are angiosperms. Angiosperms have tracheids as well as vessel elements in their xylem.

4. **Conclusion**: The only option that does not contain tracheids is **Option 3**, which refers to Bryophyta (mosses and liverworts).

### Final Answer:
The correct answer is **Option 3**: A small flowerless green plant of the division Bryophyta, which comprises the mosses and liverworts.

---