Bordered pits are found in

Options

A. sieve cells
B. vessel wall
C. companion cells
D. sieve tube wall

Explanation

**Step-by-Step Solution:**

1. **Understanding the Components**: Begin by identifying the components mentioned in the question: sieve cells, vessels, companion cells, and sieve tube cells.

2. **Identifying the Function of Each Component**:
- **Sieve Cells**: Part of the phloem, responsible for transporting food.
- **Companion Cells**: Also part of the phloem, assist in the transport of nutrients.
- **Sieve Tube Cells**: Another component of the phloem, involved in food transport.
- **Vessels**: Part of the xylem, responsible for the conduction of water.

3. **Understanding Bordered Pits**: Bordered pits are specialized structures found in the walls of certain plant cells. They are primarily associated with the xylem, which is responsible for water transport.

4. **Identifying Where Bordered Pits Are Found**: Since bordered pits are specifically mentioned to be present in the xylem, we need to focus on the vessels within the xylem.

5. **Conclusion**: Based on the information, bordered pits are found in the walls of vessels in the xylem.

**Final Answer**: Bordered pits are found in the vessel walls of the xylem.

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