Seed dormancy in tomato seeds is due to

Options

A. Impermeable seed coat
B. Immature embryo
C. Presence of ferulic acid in pulp
D. Abscisic acid in pulp

Answer

### Step-by-Step Solution:

1. **Understanding Seed Dormancy**: Seed dormancy refers to a period when seeds are inactive and do not germinate, despite favorable conditions. This state is crucial for the survival of seeds until environmental conditions are suitable for germination.

2. **Factors Contributing to Seed Dormancy**:
- **Moisture Content**: Seeds typically have a low moisture content (10-15%), which is essential for maintaining dormancy. High moisture can trigger germination.
- **Impermeability**: Some seeds have coats that are impermeable to water and oxygen, preventing germination.
- **Embryo Maturity**: The embryo must be mature enough to germinate. Immature embryos cannot initiate the germination process.
- **Germination Inhibitors**: Certain chemicals can inhibit germination. In tomato seeds, ferulic acid is a notable germination inhibitor found in the pulp of the fruit.
- **Temperature Requirements**: Some seeds require specific temperatures (e.g., chilling) to break dormancy.
- **Light Requirements**: Certain seeds need light to germinate, known as photoblastic seeds.

3. **Identifying the Cause in Tomato Seeds**:
- In the case of tomato seeds, the presence of **ferulic acid** in the pulp acts as a germination inhibitor, leading to dormancy. This is the primary reason for dormancy in tomato seeds.

4. **Conclusion**: Based on the above factors, the seed dormancy in tomato seeds is primarily due to the presence of **ferulic acid**, which inhibits germination.

### Final Answer:
Seed dormancy in tomato seeds is due to the presence of **ferulic acid**.

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