Which one is not correctly matched ?

Options

A. Cytokinin-cell division
B. IAA-cell wall elongation
C. Abscisic acid-stomatal closure
D. Gibberellic acid-Leaf fall.

Answer

To determine which option is not correctly matched, we will analyze each pair of plant hormones and their associated functions.

### Step-by-Step Solution:

1. **Cytokinin and Cell Division**:
- Cytokinins are known to promote cell division and are involved in various developmental processes in plants.
- **Conclusion**: This pair is correctly matched.

2. **IAA (Indole Acetic Acid) and Cell Wall Elongation**:
- IAA is an auxin that stimulates cell elongation by increasing the extensibility of the cell wall.
- **Conclusion**: This pair is correctly matched.

3. **Abscisic Acid and Stomatal Closure**:
- Abscisic acid is a stress hormone that plays a crucial role in closing stomata, especially during drought conditions to reduce water loss.
- **Conclusion**: This pair is correctly matched.

4. **Gibberellic Acid and Leaf Fall**:
- Gibberellic acid is primarily involved in promoting growth processes such as stem elongation and seed germination. It does not play a role in leaf fall; instead, ethylene is the hormone responsible for leaf abscission.
- **Conclusion**: This pair is not correctly matched.

### Final Answer:
The option that is not correctly matched is **Gibberellic Acid and Leaf Fall**.

---