which of the following meristems are referred as primary meristem and helps in primary growth of plant ?(a) intercalary meristem(b) apical meristem(c) lateral meristem

Options

A. (b)&(c)
B. (a)&(b)
C. (a)&(c)
D. only (b)

Answer

To determine which of the given meristems are referred to as primary meristems and help in the primary growth of plants, we can analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Meristems**:
- Meristems are regions of undifferentiated cells in plants that can divide and give rise to various tissues. They are crucial for growth.

2. **Identifying Types of Meristems**:
- There are three main types of meristems:
- **Apical Meristem**: Located at the tips of roots and shoots, responsible for the elongation of these parts.
- **Intercalary Meristem**: Found at the base of leaves and internodes, contributing to the growth in length of the stem.
- **Lateral Meristem**: Located along the sides of stems and roots, responsible for secondary growth (increase in thickness).

3. **Primary Growth**:
- Primary growth refers to the elongation of the plant body, which is primarily controlled by the apical and intercalary meristems.

4. **Analyzing Options**:
- **(a) Intercalary Meristem**: Yes, it is a primary meristem that aids in primary growth.
- **(b) Apical Meristem**: Yes, it is also a primary meristem responsible for primary growth.
- **(c) Lateral Meristem**: No, it is not a primary meristem; it is involved in secondary growth.

5. **Conclusion**:
- The meristems that are referred to as primary meristems and help in primary growth are **(a) Intercalary Meristem** and **(b) Apical Meristem**.

### Final Answer:
The correct options are (a) Intercalary Meristem and (b) Apical Meristem.