In monocotyledon seed, the outermost layer of endosperm is called

Options

A. Aleurone layer
B. Scutellum
C. Coleoptile
D. Coleorhizae

Answer

To answer the question "In monocotyledon seed, the outermost layer of endosperm is called," we will analyze the options provided and determine which one is correct.

### Step-by-Step Solution:

1. **Understanding the Structure of Monocotyledon Seeds:**
- Monocotyledon seeds, such as those of grasses and cereals, have a structure that includes an endosperm, which provides nutrition to the developing embryo.

2. **Identifying the Layers of Endosperm:**
- The endosperm in monocot seeds has different layers, and we need to identify the outermost layer.

3. **Evaluating the Options:**
- **Option 1: Aluron Layer**
- The aluron layer is indeed the outermost layer of the endosperm in monocot seeds. It is rich in proteins, which are essential for the nutrition of the seedling.
- **Option 2: Scutellum**
- The scutellum is not the outermost layer; it is a part of the seed that absorbs nutrients from the endosperm during germination.
- **Option 3: Caulicle**
- The caulicle, also known as the embryonic stem, is not related to the endosperm structure.
- **Option 4: Coleorhiza**
- The coleorhiza is a protective sheath covering the radicle (young root) of the seed and is not part of the endosperm.

4. **Conclusion:**
- After evaluating all the options, the correct answer is **Option 1: Aluron Layer**, as it is the outermost layer of the endosperm in monocot seeds.

### Final Answer:
The outermost layer of endosperm in monocotyledon seeds is called the **Aluron Layer**.