A meristematic region present between xylem and phloem of open vascular bundles is called:

Options

A. medulary ray
B. pericycle
C. pith
D. intrafascicular cambium

Answer

To solve the question regarding the meristematic region present between xylem and phloem of open vascular bundles, we can analyze the options provided:

1. **Medullary Ray**:
- Medullary rays are strips of parenchyma cells found between vascular bundles in dicot stems. They serve various functions such as storage and transport but are not considered meristematic tissue. Therefore, this option is incorrect.

2. **Pericycle**:
- The pericycle is a layer of cells that surrounds the vascular bundles in roots and stems. Its primary function is to protect the vascular tissue, but it does not serve as a meristematic region. Thus, this option is also incorrect.

3. **Pith**:
- The pith is made up of soft, spongy parenchyma cells that are located at the center of the stem, surrounded by vascular bundles. Its main role is to store water and nutrients, but it does not have meristematic properties. Therefore, this option is incorrect as well.

4. **Intrafascicular Cambium**:
- The intrafascicular cambium is indeed the meristematic tissue located between the xylem and phloem in open vascular bundles. It is responsible for secondary growth in plants, contributing to the increase in girth. This option is correct.

Thus, the correct answer to the question is **intrafascicular cambium**.