In the monocotyledon seeds , the endosperm is separated from the embryo by a distinct layer known as :

Options

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

Answer

To solve the question regarding the layer that separates the endosperm from the embryo in monocotyledon seeds, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Monocotyledon Seeds**:
- Monocotyledon seeds, commonly known as monocots, are characterized by having one cotyledon. They typically have a significant amount of endosperm, which serves as a food reserve for the developing embryo.

2. **Identifying the Components**:
- In monocot seeds, the main components include the endosperm, embryo, and seed coat. The endosperm is the tissue that provides nutrition, while the embryo is the developing plant.

3. **Recognizing the Layers**:
- The question asks for the distinct layer that separates the endosperm from the embryo. The options provided are:
- a) Testa
- b) Alluron
- c) Tegmen
- d) Hilum

4. **Analyzing Each Option**:
- **Testa**: This is the outer seed coat, which protects the seed. It does not separate the endosperm from the embryo.
- **Alluron**: This is the layer that surrounds the endosperm and is responsible for separating it from the embryo. This is the correct answer.
- **Tegmen**: This is the inner layer of the seed coat, which also does not separate the endosperm from the embryo.
- **Hilum**: This is the scar on the seed coat where the seed was attached to the fruit. It does not serve as a separating layer.

5. **Conclusion**:
- Based on the analysis, the distinct layer that separates the endosperm from the embryo in monocotyledon seeds is the **Alluron layer**.

### Final Answer:
The correct answer is **b) Alluron**.