The outer most layer of endosperm of Maize grain is called

Options

A. Scutellum
B. Perisperm
C. Aleurone layer
D. Tunica

Answer

To answer the question regarding the outermost layer of the endosperm of maize grain, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Endosperm Formation**:
- The endosperm in maize is formed through the fusion of a sperm cell with two polar nuclei (secondary nuclei). This triploid tissue serves as a nutritive source for the developing embryo.

2. **Identifying the Layers of Endosperm**:
- The endosperm can have different layers, and it's important to differentiate between them. The outermost layer is specifically what we are looking for.

3. **Recognizing the Alluron Layer**:
- The alluron layer is known to be present in many seeds, including maize. It contains hydrolytic enzymes that aid in the germination process by breaking down the endosperm to provide nutrients to the embryo.

4. **Clarifying Other Terms**:
- The term "tunica layer" refers to another layer present in the seed but is not the outermost layer.
- The "scutellum" is part of the embryo and not the endosperm.
- "Perisperm" is a nutritive tissue found in some seeds but is not related to the endosperm of maize.

5. **Conclusion**:
- Based on the information gathered, the outermost layer of the endosperm of maize grain is identified as the **alluron layer**.

### Final Answer:
The outermost layer of the endosperm of maize grain is called the **alluron layer**.

---