Hormone produced during leaf fall is

Options

A. Cytokinin
B. Florigen
C. ABA
D. IAA.

Answer

To solve the question "Hormone produced during leaf fall is," we will analyze the given options one by one to determine which hormone is associated with the process of leaf fall.

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are:
- A) Cytokinin
- B) Florigen
- C) Abscisic Acid (ABA)
- D) Auxin (IAA)

2. **Analyze Cytokinin**:
- Cytokinins are plant hormones that promote cell division and growth. They are not associated with leaf fall.
- **Conclusion**: Cytokinin is not the correct answer.

3. **Analyze Florigen**:
- Florigen is a hormone that induces flowering in plants. It is specifically involved in the flowering process and does not play a role in leaf fall.
- **Conclusion**: Florigen is not the correct answer.

4. **Analyze Abscisic Acid (ABA)**:
- Abscisic acid is known for its role in inhibiting growth and promoting senescence (aging) in plants. Senescence involves the shedding of parts of the plant, including leaves, that are no longer useful or are damaged.
- Since leaf fall is a part of the senescence process, ABA is directly involved in this process.
- **Conclusion**: Abscisic Acid (ABA) is the correct answer.

5. **Analyze Auxin (IAA)**:
- Auxins are hormones that promote growth and are involved in various growth processes, including elongation of cells. They do not promote leaf fall.
- **Conclusion**: Auxin (IAA) is not the correct answer.

### Final Answer:
The hormone produced during leaf fall is **Abscisic Acid (ABA)**.

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