In a dicot stem, the interfasicular cambium strip arises

Options

A. a) Between xylem and pholem
B. b) From medullary rays
C. c) From pith
D. d) From pericycle

Answer

To answer the question "In a dicot stem, the interfascicular cambium strip arises," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of a Dicot Stem**:
- A dicot stem has vascular bundles that consist of xylem and phloem. These bundles are arranged in a ring.

2. **Identify Types of Cambium**:
- In dicot stems, two types of cambium are involved in secondary growth: intrafascicular cambium and interfascicular cambium.

3. **Define Intrafascicular Cambium**:
- The intrafascicular cambium is the cambium that is located between the xylem and phloem within a vascular bundle.

4. **Define Interfascicular Cambium**:
- The interfascicular cambium is the cambium that forms between the vascular bundles.

5. **Source of Interfascicular Cambium**:
- The interfascicular cambium arises from the medullary rays, which are composed of parenchyma cells. These cells undergo de-differentiation to form the cambium.

6. **Conclusion**:
- Therefore, in a dicot stem, the interfascicular cambium strip arises from the medullary rays.

### Final Answer:
The correct option is **B: from medullary rays**.

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