A structure present in the ovule as well as eggs of birds is

Options

A. Integument
B. Micropyle
C. Chalaza
D. Hilum.

Answer

To solve the question regarding the structure present in both the ovule and the eggs of birds, we can analyze the options provided:

1. **Integument**: This is a protective layer that surrounds the ovule in plants, but it is not found in bird eggs.

2. **Micropyle**: This is an opening in the ovule that allows for the entry of pollen. While it is present in ovules, it is not a structure found in bird eggs.

3. **Chalaza**: This structure is found in both the ovule of plants and the eggs of birds. In bird eggs, the chalaza consists of spiral structures that help support the yolk in the albumen. In ovules, the chalaza is the region where the nucellus and integuments are joined, located around the micropyle end.

4. **Hilum**: This is a scar on the seed coat indicating where the seed was attached to the ovary wall. It is not present in bird eggs.

Based on this analysis, the correct answer is **Chalaza**.

### Step-by-Step Solution:
1. **Identify the structures**: Review the options given in the question: Integument, Micropyle, Chalaza, and Hilum.

2. **Analyze each structure**:
- **Integument**: Present in ovules but not in bird eggs.
- **Micropyle**: Present in ovules but not in bird eggs.
- **Chalaza**: Present in both ovules and bird eggs.
- **Hilum**: Present in seeds but not in bird eggs.

3. **Determine the common structure**: The only structure that is common to both the ovule and bird eggs is the **Chalaza**.

4. **Conclude the answer**: Therefore, the correct answer to the question is **Chalaza**.