TIBA is

Options

A. a gibberellin
B. an antiauxin
C. an auxin
D. kinetin

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about "TIBA". We need to identify what TIBA stands for and its role in plant biology.

2. **Analyzing the Options**:
- **Option 1: Agiberline**: This is a plant hormone known for regulating growth processes such as stem elongation, germination, dormancy, and flower development. However, it is not TIBA.
- **Option 2: Anti-oxid**: This option suggests that TIBA is related to antioxidant properties. TIBA stands for "Tri-iodobenzoic acid", which is indeed used to regulate and control plant growth, making this option potentially correct.
- **Option 3: Oxygen**: While oxygen is essential for plant respiration and root development, it is not related to TIBA.
- **Option 4: Carnitine**: This is a type of cytokinin that promotes cell division, but it is not TIBA.

3. **Identifying the Correct Answer**: After analyzing all the options, the correct answer is **Option 2: Anti-oxid**, since TIBA (Tri-iodobenzoic acid) is involved in regulating plant growth and has antioxidant properties.

4. **Conclusion**: Therefore, TIBA is primarily recognized as Tri-iodobenzoic acid, which plays a significant role in the regulation of plant growth.