When the incisions of leaf lamina reach upto the midrib the left is known as

Answer

**Step-by-Step Solution:**

1. **Understanding Leaf Structure**: A leaf consists of a broad, flat part called the lamina, which is attached to the stem by a stalk known as the petiole.

2. **Incisions in Leaf Lamina**: The question refers to incisions or cuts in the leaf lamina. These incisions can vary in depth and can either be shallow or deep.

3. **Reaching the Midrib**: When the incisions in the leaf lamina extend all the way to the midrib (the central vein of the leaf), it indicates that the leaf is divided into smaller sections.

4. **Definition of Compound Leaf**: A leaf that has been divided into multiple smaller leaf-like structures, known as leaflets, is classified as a compound leaf.

5. **Types of Compound Leaves**: There are two main types of compound leaves:
- **Pinnate Compound Leaf**: Leaflets are arranged on either side of a central axis (rachis).
- **Palmate Compound Leaf**: Leaflets arise from a single point at the end of the petiole.

6. **Conclusion**: Therefore, when the incisions of the leaf lamina reach up to the midrib, the leaf is classified as a compound leaf.

**Final Answer**: The leaf is known as a **compound leaf**.

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