The wheat grain/maize grain has an embryo with one, large, shield shaped cotyledon known as:

Options

A. scutellum
B. epiblast
C. tigellum
D. aleurone

Explanation

To solve the question regarding the wheat grain or maize grain having an embryo with one large, shield-shaped cotyledon, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the name of the cotyledon in the wheat or maize grain that is characterized as one large and shield-shaped.

2. **Identifying the Options**: The options provided include:
- A) Scutellum
- B) Epiblast
- C) Tigellum
- D) Aileron

3. **Analyzing Each Option**:
- **Option D: Aileron**: This is the outermost layer of the endosperm and does not represent a cotyledon. Therefore, this option is incorrect.
- **Option C: Tigellum**: This refers to the main axis of the embryo, which includes the radical and plumule but does not denote the cotyledon itself. Thus, this option is also incorrect.
- **Option B: Epiblast**: This term is associated with animal cells and is not relevant to plant cotyledons. Hence, this option is incorrect.
- **Option A: Scutellum**: This is the correct term for the cotyledon of the wheat grain or maize grain. It is indeed a large, shield-shaped structure.

4. **Conclusion**: After analyzing all the options, the correct answer is **A) Scutellum**.

### Final Answer:
The cotyledon of the wheat grain or maize grain is known as the **scutellum**.

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