The inner layer of the seed coat is called

Options

A. Testa
B. Hilum
C. Micropyle
D. Tegmen

Answer

To answer the question "The inner layer of the seed coat is called," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Seed Structure**:
- A seed consists of two main parts: the seed coat and the embryo. The seed coat is the protective outer covering of the seed.

2. **Formation of Seed Coat**:
- The seed coat develops from the integuments of the ovule after fertilization. The integuments are the layers that surround the ovule.

3. **Types of Seed Coats**:
- In flowering plants, particularly dicots, the seed coat can be either single-layered or double-layered.

4. **Identifying Layers of Seed Coat**:
- If the seed coat is double-layered, the outer layer is formed from the outer integument, which is called the **testa**.
- The inner layer of the seed coat is formed from the inner integument, which is known as the **tegmen**.

5. **Evaluating the Options**:
- The options given are:
- **Testa**: This is the outer layer of the seed coat (incorrect).
- **Phylum**: This term refers to a taxonomic rank and is not related to seed structure (incorrect).
- **Micropyle**: This is the small opening in the ovule (incorrect).
- **Tegmen**: This is the correct term for the inner layer of the seed coat.

6. **Conclusion**:
- Therefore, the inner layer of the seed coat is called the **tegmen**.

### Final Answer:
The inner layer of the seed coat is called **tegmen**.