Leaves of Monocot or grass leaves and stem of bamboo, and mint grow in size to activity of

Options

A. apical meristem
B. intercalary meristem
C. lateral meristem
D. dermatogen

Answer

To solve the question regarding the growth of leaves of monocots (like grass), and the stems of bamboo and mint, we need to identify which type of meristematic tissue is responsible for their growth. Here’s a step-by-step breakdown of the solution:

### Step-by-Step Solution:

1. **Understanding Monocots and Their Growth:**
- Monocots, such as grasses, have specific growth patterns. They do not undergo secondary growth, which is typical in dicots.

2. **Identifying Meristematic Tissues:**
- Meristematic tissues are responsible for the growth of plants. They can be classified into different types:
- Apical meristem
- Lateral (or secondary) meristem
- Intercalary meristem
- Dermatogen

3. **Eliminating Incorrect Options:**
- **Lateral Meristem:** This type is responsible for secondary growth (increase in girth) and is absent in monocots. Therefore, it cannot be responsible for the growth in size of monocot leaves and stems.
- **Dermatogen:** This is involved in forming the epidermis (outer layer) of the plant and does not contribute to size increase. Hence, it is also not the correct answer.

4. **Analyzing Remaining Options:**
- **Apical Meristem:** This is located at the tips of roots and shoots and is responsible for the elongation of the plant (increasing length), not the size.
- **Intercalary Meristem:** This type is found at the base of leaves and at the nodes of stems. It is responsible for the growth of internodes and leaf elongation, which contributes to the increase in size of monocot leaves and stems.

5. **Conclusion:**
- Given that the leaves of monocots and the stems of bamboo and mint grow in size primarily due to the activity of intercalary meristem, we conclude that the correct answer is the intercalary meristem.

### Final Answer:
The leaves of monocots (like grass) and the stems of bamboo and mint grow in size due to the activity of **intercalary meristem**.