The axillary bud is constituted by the cells 'left behind' from-

Options

A. Root apical meristem
B. Shoot apical meristem
C. Intercalary meristem
D. Lateral meristem

Answer

To answer the question "The axillary bud is constituted by the cells 'left behind' from-", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Axillary Buds**:
- An axillary bud is a small bud that forms in the axil of a leaf, which is the angle between the leaf and the stem. It has the potential to develop into a branch or flower.

2. **Identifying Meristem Types**:
- There are different types of meristems in plants, including:
- **Apical Meristem**: Located at the tips of roots and shoots, responsible for the vertical growth of the plant.
- **Lateral Meristem**: Found along the sides of stems and roots, responsible for the increase in girth.
- **Intercalary Meristem**: Located at the nodes and internodes, responsible for growth in length at these regions.
- **Root Apical Meristem**: Located at the tips of roots, responsible for root growth.

3. **Eliminating Incorrect Options**:
- Since the axillary bud is associated with the shoot system, we can eliminate the root apical meristem as it pertains to root growth.
- The lateral meristem does not contribute to the formation of axillary buds, as it is involved in increasing the girth of the plant.
- The intercalary meristem is also not responsible for axillary bud formation, as it mainly contributes to the elongation of the internodes.

4. **Identifying the Correct Answer**:
- The shoot apical meristem is responsible for the growth of the shoot and is the source of the cells that form the axillary buds. Therefore, the axillary bud is constituted by the cells 'left behind' from the shoot apical meristem.

### Final Answer:
The axillary bud is constituted by the cells 'left behind' from the **shoot apical meristem**.

---