Which one of the following hormone plays an important role in seed development, maturation and dormancy?

Options

A. ABA
B. IAA
C. GA
D. CK

Answer

**Step-by-Step Solution:**

1. **Identify the Hormones Listed:**
The question provides four hormones: Abscisic Acid (ABA), Indole-3-Acetic Acid (IAA), Gibberellins (GA), and Cytokinins (CK).

2. **Understand the Functions of Each Hormone:**
- **Abscisic Acid (ABA):** Known as the stress hormone, it plays a crucial role in seed development and maturation. It also induces dormancy in seeds and inhibits germination.
- **Indole-3-Acetic Acid (IAA):** This is an auxin that primarily regulates plant growth, particularly in apical dominance and fruit development, but it is not directly involved in seed dormancy.
- **Gibberellins (GA):** These hormones promote stem elongation, seed germination, and flowering. They help break dormancy but are not responsible for maintaining it.
- **Cytokinins (CK):** These hormones are involved in cell division and growth, delay senescence, and promote nutrient mobilization, but they do not play a significant role in seed dormancy.

3. **Determine the Role of Each Hormone in Relation to the Question:**
The question specifically asks for the hormone that plays an important role in seed development, maturation, and dormancy. Among the listed hormones, ABA is the only one that fits all three criteria.

4. **Conclude with the Correct Answer:**
Based on the roles of the hormones, the correct answer to the question is **Abscisic Acid (ABA)**.

**Final Answer:**
The hormone that plays an important role in seed development, maturation, and dormancy is **Abscisic Acid (ABA)**.

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