Which one of the following plant hormones is not correctly matched with its function?

Options

A. Abscisic acid - Stomatal closure
B. Gibberellic acid - leaf fall
C. Cytokinin - Cell division
D. IAA - Apical dominance

Answer

To solve the question about which plant hormone is not correctly matched with its function, we will analyze each option provided:

1. **Abscisic Acid (ABA)** - Stomatal Closer:
- Abscisic Acid is known as the stress hormone. It plays a crucial role in response to stress conditions, particularly water stress. When the plant experiences water scarcity, ABA is produced, leading to the closure of stomata to reduce water loss through transpiration.
- **Conclusion**: This match is correct.

2. **Zybarlic Acid (likely a typo for Gibberellic Acid)** - Leaf Fall:
- Gibberellic Acid (GA) is primarily involved in promoting growth processes such as stem elongation, seed germination, and flowering. It does not promote leaf fall; instead, it encourages growth. The hormones primarily responsible for leaf fall are abscisic acid and ethylene.
- **Conclusion**: This match is incorrect.

3. **Cytokinin** - Cell Division:
- Cytokinins are known to promote cell division and are involved in various growth processes, including shoot formation and delaying senescence (aging) in leaves. They also help in overcoming apical dominance.
- **Conclusion**: This match is correct.

4. **IAA (Indole-3-Acetic Acid)** - Apical Dominance:
- IAA is a natural auxin that plays a significant role in apical dominance, which is the phenomenon where the main central stem of the plant grows more strongly than the side stems. This is due to the distribution of auxins in the plant.
- **Conclusion**: This match is correct.

After analyzing all the options, the incorrect match is:

**Answer**: Zybarlic Acid (Gibberellic Acid) - Leaf Fall.