The length of different internodes in a culm of sugarcane is variable because

Options

A. shoot apical meristem
B. position of axillary buds
C. size of leaf lamina at the node below each internode
D. intercalary meristem

Answer

### Step-by-Step Solution:

1. **Understanding the Structure of Sugarcane**:
- Sugarcane is a type of grass that has a culm, which is the stem of the plant. The stem is divided into segments known as internodes.

2. **Identifying the Components**:
- Each internode is separated by a node, which is the point where leaves and branches can emerge. The nodes are crucial for the growth and development of the plant.

3. **Role of Meristems**:
- Meristems are regions in plants where cells can divide and differentiate. There are different types of meristems, including apical meristems, lateral meristems, and intercalary meristems.

4. **Focus on Intercalary Meristem**:
- Intercalary meristems are located at the base of internodes and are responsible for the elongation of stems. They allow for rapid growth and regrowth of the plant.

5. **Explaining Variability in Internode Length**:
- The variability in the length of different internodes in sugarcane is primarily due to the activity of intercalary meristems. These meristems enable the plant to grow taller and adapt to environmental conditions.

6. **Conclusion**:
- Therefore, the correct answer to the question is that the length of different internodes in a culm of sugarcane is variable because of the presence and activity of intercalary meristem.