Prechilling treatment to break seed dormancy is

Options

A. Scarification
B. Vernalization
C. Impaction
D. Stratification

Answer

### Step-by-Step Solution:

1. **Understanding Seed Dormancy**:
- Seed dormancy is a condition where seeds do not germinate even when conditions are favorable for growth. This is a protective mechanism that ensures seeds only germinate when the environment is suitable for survival.

2. **Identifying Pre-Chilling Treatment**:
- Pre-chilling treatment is a method used to break seed dormancy. It involves exposing seeds to cold temperatures to stimulate germination.

3. **Exploring Different Options**:
- **Scarification**: This process involves mechanically or chemically breaking down the hard seed coat to allow water and air to penetrate, but it does not specifically involve chilling.
- **Vernalization**: This refers to the cooling of seeds to promote flowering, but it is not primarily aimed at breaking seed dormancy.
- **Impaction**: This term generally refers to applying force or shaking, which is not relevant to chilling treatment.
- **Stratification**: This is the process where seeds are moistened and kept at low temperatures for a certain period to break dormancy. It specifically involves chilling and is the correct method for pre-chilling treatment.

4. **Conclusion**:
- Based on the definitions and processes discussed, the correct answer to the question "Prechilling treatment to break seed dormancy is?" is **Stratification**.