What is scratching of seed coat to break seed dormancy called ?

Explanation

**Step-by-Step Solution:**

1. **Understanding Seed Dormancy**: Seed dormancy is a state in which seeds are unable to germinate despite favorable conditions. This can be due to various factors, including a hard seed coat.

2. **Role of Seed Coat**: The seed coat protects the seed but can sometimes be too thick or hard, preventing water and oxygen from entering, which are essential for germination.

3. **Need for Breaking Dormancy**: To allow seeds to germinate, it is often necessary to break or soften the seed coat. This process is crucial for seeds that have a hard outer layer.

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