The meristem which occurs between mature tissues and responsible for primary growth called :

Options

A. Intercalary
B. Secondary
C. Lateral
D. Both 2 and 3

Answer

To solve the question regarding the type of meristem that occurs between mature tissues and is responsible for primary growth, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Meristems**:
- Meristems are regions of undifferentiated cells in plants that are capable of division and growth. They are classified into primary and secondary meristems.
- Primary meristems are responsible for the growth in length (primary growth), while secondary meristems contribute to the growth in thickness (secondary growth).

2. **Identify the Meristem Types Mentioned**:
- The options provided are intercalary, secondary, lateral, and both 2 and 3.
- Intercalary meristem is a type of primary meristem found between mature tissues.
- Secondary meristem includes lateral meristems like vascular cambium and cork cambium, which are involved in secondary growth.

3. **Focus on Primary Growth**:
- Since the question specifically asks for the meristem responsible for primary growth, we need to identify which of the options relates to this.
- Intercalary meristem is known to be involved in primary growth and is typically located at the base of nodes or internodes.

4. **Eliminate Incorrect Options**:
- Secondary and lateral meristems are not responsible for primary growth; they are involved in secondary growth.
- Therefore, options 2 (secondary) and 3 (lateral) can be eliminated.

5. **Conclude with the Correct Answer**:
- The only meristem that fits the description of occurring between mature tissues and responsible for primary growth is the intercalary meristem.

### Final Answer:
The meristem which occurs between mature tissues and is responsible for primary growth is called **intercalary meristem**.