Vesselless angiosperms is/are

Options

A. Drimys
B. Trochodendron
C. Tetracentron
D. All of these

Answer

### Step-by-Step Solution:

1. **Understanding Vessel Elements**:
- Vessel elements are specialized cells in the xylem of angiosperms that facilitate the transport of water and nutrients. They are typically absent in gymnosperms.

2. **Identifying Vessel-less Angiosperms**:
- While most angiosperms possess vessel elements, there are exceptions known as vessel-less angiosperms. These plants rely on tracheids for water conduction instead of vessels.

3. **Examples of Vessel-less Angiosperms**:
- The question provides four options: Drimus, Trocodendron, Tetrocentron, and Hydrila. We need to determine if these examples are indeed vessel-less angiosperms.

4. **Verifying Each Option**:
- **Drimus**: This is a known vessel-less angiosperm.
- **Trocodendron**: This is also recognized as a vessel-less angiosperm.
- **Tetrocentron**: This plant is another example of a vessel-less angiosperm.
- **Hydrila**: This is known to be a vessel-less angiosperm as well.

5. **Conclusion**:
- Since all the provided options (Drimus, Trocodendron, Tetrocentron) are vessel-less angiosperms, the correct answer to the question is "all of these".

### Final Answer:
All of these (Drimus, Trocodendron, Tetrocentron).

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