Companion cells are found in
(a) Epidermis
(b) Cambium
(c) Xylem
(d) Phloem

Options

A. Epidermis
B. Cambium
C. Xylem
D. Phloem

Answer

**Step-by-Step Solution:**

1. **Understanding Companion Cells**: Companion cells are specialized cells that play a crucial role in the phloem tissue of plants. They are characterized by their large size and elongated shape.

2. **Location of Companion Cells**: Companion cells are specifically associated with the sieve tubes in the phloem. They are located adjacent to the sieve tube elements and are essential for their function.

3. **Function of Companion Cells**: The primary function of companion cells is to assist in the translocation of food materials, particularly sucrose, throughout the plant. They help regulate the activity of the sieve tubes and ensure efficient transport.

4. **Analyzing the Options**:
- (a) Epidermis: This is the outer layer of cells in plants and does not contain companion cells.
- (b) Cambium: This is a layer of tissue responsible for secondary growth in plants, not related to companion cells.
- (c) Xylem: This tissue is responsible for water and mineral transport, and does not contain companion cells.
- (d) Phloem: This is the correct answer, as companion cells are an integral part of the phloem tissue.

5. **Conclusion**: Based on the information about companion cells and their association with phloem, the correct answer is (d) Phloem.

**Final Answer**: (d) Phloem

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