Gymnosperms do not have

Options

A. Xylem vessels and sieve tubes
B. Tracheids and sieve tubes
C. Vessels, sieve tubes and companion cells
D. Tracheids and companion cells.

Answer

**Step-by-Step Solution:**

1. **Understanding Gymnosperms**: Gymnosperms are a group of seed-producing plants that do not form flowers or fruits. Their seeds are exposed or naked, typically found on cones.

2. **Identifying Vascular Tissues**: Gymnosperms possess vascular tissues, which include xylem and phloem. These tissues are essential for the transport of water, nutrients, and food throughout the plant.

3. **Analyzing Xylem Composition**: In gymnosperms, the xylem is primarily composed of tracheids, which are long, narrow cells that help in the conduction of water. However, gymnosperms lack xylem vessels, which are present in angiosperms (flowering plants).

4. **Analyzing Phloem Composition**: The phloem in gymnosperms does not contain sieve tubes or companion cells. Instead, it primarily consists of sieve cells, which are less specialized than the sieve tubes found in angiosperms.

5. **Conclusion**: Based on the analysis, gymnosperms do not have:
- Xylem vessels
- Sieve tubes
- Companion cells

6. **Final Answer**: Therefore, the correct option is that gymnosperms do not have "vessels, sieve tubes, and companion cells."

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