Which is incorrectly matched

Options

A. Adenine derivative-Kinetin
B. Terpenes-IAA
C. Carotenoid derivative- ABA
D. Indole compounds-IBA

Answer

To determine which option is incorrectly matched, we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Analyze the first option: Adenine derivative - Kinetin**
- Kinetin is classified as a cytokinin, which is indeed an adenine derivative.
- **Conclusion**: This option is correctly matched.

2. **Analyze the second option: Terpenes - IAA (Indole Acetic Acid)**
- IAA, or Indole Acetic Acid, is not a terpene; it is an auxin.
- Terpenes include compounds like gibberellic acid, which are different from IAA.
- **Conclusion**: This option is incorrectly matched.

3. **Analyze the third option: Carotenoid derivative - ABA (Abscisic Acid)**
- ABA is known as a carotenoid derivative and is often referred to as the stress hormone.
- It plays a role in processes such as abscission (the shedding of leaves).
- **Conclusion**: This option is correctly matched.

4. **Analyze the fourth option: Indole compounds - IBA (Indole Butyric Acid)**
- IBA is indeed an indole compound and acts as a growth promoter.
- **Conclusion**: This option is correctly matched.

### Final Conclusion:
The only option that is incorrectly matched is the second one: **Terpenes - IAA (Indole Acetic Acid)**.