Common inhibitor of germination is

Options

A. vernalin
B. pantothenic acid
C. GA
D. ABA

Answer

**Step-by-Step Text Solution:**

1. **Understanding Seed Germination**: Germination is the process by which a seed develops into a new plant. For germination to occur, certain conditions must be met, including the right temperature, moisture, and the absence of inhibitors.

2. **Identifying Inhibitors of Germination**: Inhibitors are substances that prevent or delay the germination of seeds. They maintain the dormancy of seeds, which is a state where seeds are alive but not actively growing.

3. **Role of Hormones in Seed Dormancy**: Among the various hormones that affect plant growth and development, one hormone is particularly known for its role in maintaining seed dormancy.

4. **Abscisic Acid (ABA)**: The common inhibitor of germination is abscisic acid (ABA). This hormone is crucial in regulating seed dormancy and is often referred to as the "stress hormone" because it helps plants respond to stress conditions.

5. **Mechanism of Action**: Abscisic acid inhibits plant growth and metabolism, which helps maintain the dormancy of seeds. By doing so, it allows seeds to withstand unfavorable conditions until the environment is suitable for germination.

6. **Conclusion**: Therefore, the common inhibitor of germination is abscisic acid.

**Final Answer**: The common inhibitor of germination is abscisic acid.

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