In a cereal grain, the single cotyledon of an embryo is represented by the

Options

A. coleoptile
B. coleorhiza
C. prophyll
D. scutellum

Answer

To solve the question regarding the representation of the single cotyledon of an embryo in a cereal grain, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Cotyledons**: Cotyledons are the first leaves that appear from a seed during germination. They are crucial for the initial stages of a plant's growth and can vary in number. Monocots, like cereal grains, have one cotyledon.

2. **Identifying the Structure in Cereal Grains**: In cereal grains, the structure that represents the single cotyledon is specific to monocots. We need to identify which option corresponds to this structure.

3. **Analyzing the Options**:
- **Coleoptile**: This is the protective sheath covering the emerging shoot in monocots. It does not represent the cotyledon itself.
- **Coleorhiza**: This is the protective covering for the root in monocots. It does not represent the cotyledon.
- **Prophyll**: This refers to a rudimentary leaf and does not have a direct link to the cotyledon.
- **Scutellum**: This is a specialized structure found in monocot seeds that acts as a single cotyledon. It is responsible for the absorption of nutrients from the endosperm during germination.

4. **Conclusion**: The correct answer is the **scutellum**, as it is the structure in cereal grains that represents the single cotyledon of the embryo.

### Final Answer:
The single cotyledon of an embryo in a cereal grain is represented by the **scutellum**.

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