Which type of phytohormone is made up of indole compounds?

Options

A. Zeatin
B. ABA
C. Auxin
D. Gibberellins

Answer

To answer the question "Which type of phytohormone is made up of indole compounds?", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Phytohormones**: Phytohormones, or plant hormones, are chemical substances that regulate plant growth and development. They play crucial roles in various physiological processes.

2. **Identifying the Options**: The options given are:
- Beziatin
- Abscisic Acid (ABA)
- Auxin
- Gibberellin

3. **Analyzing Each Option**:
- **Beziatin**: This is not a well-known phytohormone, and it does not relate to indole compounds.
- **Abscisic Acid (ABA)**: This hormone is known as the stress hormone and does not contain indole compounds.
- **Auxin**: Auxins are a class of phytohormones that are primarily responsible for the elongation of cells in the plant. A key component of auxins is indole-3-acetic acid (IAA), which is an indole compound.
- **Gibberellin**: This hormone is involved in promoting growth and development but does not contain indole compounds.

4. **Conclusion**: Based on the analysis, auxin is the type of phytohormone that is made up of indole compounds, specifically indole-3-acetic acid.

### Final Answer:
The type of phytohormone made up of indole compounds is **Auxin**.

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