Monocotylendonous seeds possess a single cotyledon which is represented by

Options

A. tegmen
B. endosperm
C. scutellum
D. aleurone.

Explanation

To answer the question regarding what the single cotyledon in monocotyledonous seeds is represented by, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Monocotyledonous Seeds**:
- Monocotyledonous seeds are characterized by having a single cotyledon. This is a key feature that differentiates them from dicotyledonous seeds, which have two cotyledons.

2. **Identify the Components of Monocot Seeds**:
- In monocot seeds, the main components include the endosperm, cotyledon (which is the scutellum), the radical (which develops into the root), and the plumule (which develops into the shoot).

3. **Determine the Role of the Cotyledon**:
- The cotyledon in monocots is primarily responsible for nutrient storage and is involved in the early stages of seedling development. In monocots, this cotyledon is specifically referred to as the "scutellum."

4. **Analyze the Options Given**:
- The options provided are segments, endosperm, scutellum, and aileron.
- The endosperm serves as a food reserve but is not the cotyledon itself.
- Segments and aileron do not pertain to the structure of monocot seeds.

5. **Select the Correct Answer**:
- Since the single cotyledon in monocotyledonous seeds is represented by the scutellum, the correct answer is option 3: **scutellum**.

### Final Answer:
The single cotyledon in monocotyledonous seeds is represented by **scutellum**.

---