One can distinguish a leaflet from leaf by the absence of

Options

A. Midrib
B. petiole
C. Axillary bud
D. Venation

Answer

To solve the question "One can distinguish a leaflet from leaf by the absence of," we need to analyze the given options and understand the differences between a leaflet and a leaf.

### Step-by-Step Solution:

1. **Understanding Leaf Structure**:
- A leaf is a broad, flat structure that is typically undivided and consists of a petiole (the stalk) and a lamina (the blade).
- A leaflet, on the other hand, is a part of a compound leaf. In compound leaves, the lamina is divided into multiple leaflets.

2. **Analyzing the Options**:
- **Midrib**: The midrib is the central vein of a leaf. It is present in both simple leaves and compound leaves (leaflets). Therefore, this option is incorrect.
- **Petiole**: The petiole is the stalk that attaches the leaf to the stem. It is also present in both simple and compound leaves. Thus, this option is incorrect.
- **Venation**: Venation refers to the arrangement of veins in the leaf. Both simple leaves and compound leaves have venation. Therefore, this option is incorrect.
- **Axillary Bud**: An axillary bud is a bud that develops in the axil (the angle between the leaf and the stem). This structure is present in simple leaves but is absent in compound leaves (leaflets). Therefore, this option is correct.

3. **Conclusion**:
- The correct answer is **axillary bud**. This is the structure that distinguishes a leaflet from a leaf, as axillary buds are present in simple leaves but absent in leaflets of compound leaves.

### Final Answer:
One can distinguish a leaflet from a leaf by the absence of **axillary bud**.

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