Which one is secondary lateral meristem?

Options

A. Intercalary
B. Cork cambium
C. Interfascicular cambium
D. Both b and c

Answer

To determine which one is a secondary lateral meristem among the given options, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understand the Types of Meristems**:
- Meristems are regions in plants where cells are actively dividing. They are classified into primary and secondary meristems.
- Primary meristems are responsible for the primary growth of the plant, leading to an increase in length.
- Secondary meristems contribute to secondary growth, which increases the thickness or girth of the plant.

2. **Evaluate Option 1: Intercalary Meristem**:
- Intercalary meristem is located at the base of leaves or internodes in some plants (like grasses).
- It is a **primary meristem** because it contributes to the primary growth of the plant.
- **Conclusion**: Intercalary meristem is NOT a secondary lateral meristem.

3. **Evaluate Option 2: Core Cambium**:
- Core cambium is a type of cambium that forms between the bark (cork) and the secondary cortex.
- It is involved in the secondary growth of the plant, producing secondary tissues.
- **Conclusion**: Core cambium IS a secondary lateral meristem.

4. **Evaluate Option 3: Inter-fuscular Cambium**:
- Inter-fuscular cambium is found between the xylem and phloem in vascular bundles.
- It also contributes to secondary growth by producing secondary xylem and phloem.
- **Conclusion**: Inter-fuscular cambium IS a secondary lateral meristem.

5. **Evaluate Option 4: Both B and C**:
- Since both core cambium (Option 2) and inter-fuscular cambium (Option 3) are identified as secondary lateral meristems, this option states that both are correct.
- **Conclusion**: Option 4 is correct as it includes both secondary lateral meristems.

### Final Answer:
The secondary lateral meristems among the options provided are **both B (Core Cambium) and C (Inter-fuscular Cambium)**.

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