The hormonal substance which migrates from leaves to shoot apices flowering is

Options

A. Dormin
B. Zeatin
C. Kinetin
D. Florigen

Answer

To solve the question regarding the hormonal substance that migrates from leaves to shoot apices to initiate flowering, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding the Question**: The question is asking for a specific hormone that is responsible for the migration from leaves to the shoot apices to trigger flowering in plants.

2. **Analyzing Option 1: Dormin**:
- Dormin is another name for Abscisic Acid (ABA).
- Abscisic Acid is known to induce dormancy in seeds and buds, which means it does not promote flowering.
- **Conclusion**: Dormin is not the correct answer.

3. **Analyzing Option 2: Zeatin**:
- Zeatin is a type of cytokinin.
- Cytokinins, including zeatin, are primarily involved in promoting cell division and growth, but they do not specifically induce flowering.
- **Conclusion**: Zeatin is not the correct answer.

4. **Analyzing Option 3: Kinetin**:
- Kinetin is also a form of cytokinin.
- Similar to zeatin, kinetin promotes cell division and growth, but it does not play a direct role in initiating flowering.
- **Conclusion**: Kinetin is not the correct answer.

5. **Analyzing Option 4: Florigen**:
- Florigen is a hypothetical hormone that is believed to be produced in the leaves.
- It is thought to migrate from the leaves to the shoot apices to initiate flowering.
- Since florigen is specifically associated with the flowering process, it fits the criteria mentioned in the question.
- **Conclusion**: Florigen is the correct answer.

### Final Answer:
The hormonal substance which migrates from leaves to shoot apices to initiate flowering is **Florigen**.

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