To remove seed dormancy by mechanically removing the seed coat, is called

Options

A. stratification
B. scarification
C. vernalization
D. photoperiodism

Answer

To answer the question "To remove seed dormancy by mechanically removing the seed coat, is called," we need to identify the correct term from the options provided: stratification, scarification, ventrilization, and photoperiodism.

### Step-by-Step Solution:

1. **Understanding Seed Dormancy**: Seed dormancy is a period during which seeds do not germinate even under favorable conditions. This dormancy can be due to a hard seed coat that prevents water and gases from entering the seed.

2. **Identifying the Process**: The question asks for a mechanical method to remove seed dormancy. This involves physically altering or breaking the seed coat to allow water and gases to penetrate, which is essential for germination.

3. **Defining Scarification**: The correct term for this mechanical process is "scarification." Scarification refers to the nicking, breaking, softening, or otherwise weakening of the seed coat (testa) to facilitate germination.

4. **Mechanism of Scarification**: By scarifying seeds, the hard outer layer is altered through methods such as scratching, breaking, or using chemical or thermal means. This process makes the seed coat permeable to water and gases, thus speeding up the germination process.

5. **Conclusion**: Based on the definitions and processes discussed, the correct answer to the question is **scarification**.

### Final Answer:
The process of removing seed dormancy by mechanically removing the seed coat is called **scarification**.

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