The outer covering of the endosperm in a monocot seed separates embryo by a proteinaceous layer called

Options

A. Scutellum
B. Cotyledon
C. Radicle
D. Aleurone layer

Answer

To answer the question regarding the outer covering of the endosperm in a monocot seed that separates the embryo by a proteinaceous layer, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Monocot Seeds**:
- Monocot seeds, such as those of rice or corn, have a structure that includes an endosperm and an embryo. The endosperm serves as a source of nutrition for the developing embryo.

2. **Identifying Seed Structures**:
- In a monocot seed, the endosperm surrounds the embryo. The embryo consists of different parts, including the radical (which develops into the root) and the plumule (which develops into the shoot).

3. **Recognizing the Proteinaceous Layer**:
- Between the endosperm and the embryo, there is a specific layer that separates these two structures. This layer is crucial as it provides a barrier and has a significant role in the nourishment process.

4. **Naming the Layer**:
- The proteinaceous layer that separates the embryo from the endosperm in monocot seeds is known as the **Aleurone layer**. This layer is rich in proteins and plays an important role in the seed's metabolism and nutrient storage.

5. **Conclusion**:
- Therefore, the correct answer to the question is that the outer covering of the endosperm in a monocot seed that separates the embryo is called the **Aleurone layer**.