A leaf is identified from

Options

A. Flat green lamina
B. Presence of leaf blade and petiole
C. Presence of axillary bud
D. Occurrence of chlorophyll.

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the identification of a leaf based on certain characteristics. We need to evaluate the given options.

2. **Analyzing the Options**:
- **Flat Green Lamina**: While leaves generally have a flat green lamina, this characteristic alone does not uniquely identify a leaf since other structures may also exhibit similar features.
- **Presence of Leaf Blade and Petiole**: Similar to the lamina, the presence of a leaf blade and petiole is common in many plants, but not all leaves have these structures.
- **Presence of Axillary Bud**: The axillary bud is located at the axil of the leaf, which is the angle between the leaf and the stem. This is a unique feature that helps in identifying a leaf.
- **Occurrence of Chlorophyll**: While chlorophyll is a common pigment found in leaves, some plants may not have chlorophyll, making this option unreliable for identification.

3. **Identifying the Correct Option**: Among the options provided, the presence of the axillary bud is the most reliable characteristic for identifying a leaf, as it is specifically located at the junction of the leaf and stem.

4. **Conclusion**: The correct answer is the "presence of axillary bud," as it serves as a definitive marker for identifying a leaf.