A narrow layer of thin-walled cells found between phloem/bark and wood of a dicot is

Options

A. endodermis
B. vascular cambium
C. pericycle
D. cork cambium

Answer

To solve the question about the narrow layer of thin-walled cells found between phloem/bark and wood of a dicot, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Dicot Stems**:
- In dicotyledonous plants, the stem has a distinct structure that includes the epidermis, cortex, vascular bundles (which contain xylem and phloem), and pith.

2. **Identify the Relevant Tissues**:
- The vascular bundles in dicots are arranged in a ring and consist of xylem (wood) on the inside and phloem (bark) on the outside.

3. **Locate the Layer Between Phloem and Xylem**:
- The question specifically asks for the layer of cells located between the phloem and the xylem (wood).

4. **Evaluate the Options**:
- The options given are:
- A) Androdermis
- B) Vascular cambium
- C) Pericycle
- D) Cork cambium

5. **Analyze Each Option**:
- **Androdermis**: This is not correct as it is located beneath the cortex and does not contribute to secondary growth.
- **Vascular cambium**: This is the correct answer. It is a layer of meristematic tissue that produces secondary xylem (wood) on the inner side and secondary phloem (bark) on the outer side.
- **Pericycle**: This is incorrect as it is located beneath the endodermis and does not serve the purpose described in the question.
- **Cork cambium**: This is part of the periderm and is not located between phloem and xylem.

6. **Conclude the Answer**:
- Based on the analysis, the correct answer is **B) Vascular cambium**.

### Final Answer:
The narrow layer of thin-walled cells found between phloem/bark and wood of a dicot is **vascular cambium**.