Intrafascicular cambium is primary in origin.

Answer

### Step-by-Step Solution:

1. **Understanding the Definition**: Intrafascicular cambium is a type of cambium found in the vascular bundles of dicot stems. It is located between the xylem and phloem tissues.

2. **Identifying the Origin**: The statement claims that intrafascicular cambium is primary in origin. This means it is derived from the primary meristematic tissue.

3. **Role of Procambium**: The intrafascicular cambium originates from the procambium, which is a type of embryonic meristem. This embryonic meristem is responsible for the formation of primary vascular tissues.

4. **Location in Dicot Stem**: In a typical dicot stem, the intrafascicular cambium is situated between the primary xylem (located inward) and the primary phloem (located outward). This positioning is crucial for its function in secondary growth.

5. **Function During Secondary Growth**: Although it is primary in origin, the intrafascicular cambium plays a vital role during secondary growth by producing secondary xylem and secondary phloem, which contribute to the increase in girth of the plant.

6. **Conclusion**: Therefore, the statement that "intrafascicular cambium is primary in origin" is true because it arises from the procambium, which is a primary meristematic tissue.