Hormone that breaks dormancy of seeds/potato tuber is

Options

A. IAA
B. ABA
C. Zeatin
D. Gibberellin

Answer

To answer the question regarding the hormone that breaks dormancy of seeds and potato tubers, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for a specific hormone that is responsible for breaking the dormancy of seeds and potato tubers.

2. **Analyze the Options**: The options provided are:
- A) IAA (Indole-3-acetic acid)
- B) ABA (Abscisic acid)
- C) Zeatin
- D) Zebralin

3. **Evaluate Each Option**:
- **IAA (Indole-3-acetic acid)**: This is an auxin that primarily promotes cell elongation and is not specifically known for breaking dormancy.
- **ABA (Abscisic acid)**: This hormone is known for inducing dormancy and is involved in stress responses, making it unlikely to break dormancy.
- **Zeatin**: This is a type of cytokinin that promotes cell division and growth of lateral buds but does not specifically break dormancy.
- **Zebralin**: This is a plant hormone that is known to break dormancy in seeds and potato tubers and also induces germination.

4. **Identify the Correct Answer**: Based on the evaluations, Zebralin is the hormone that breaks dormancy in seeds and potato tubers. Therefore, the correct answer is **D) Zebralin**.

5. **Conclusion**: The hormone that breaks dormancy of seeds and potato tubers is Zebralin.