What is hilum with respect to ovule?

Answer

### Step-by-Step Solution:

1. **Definition of Hilum**: The hilum is a specific region on the ovule where it connects to the funicle (the stalk that attaches the ovule to the placenta).

2. **Structure of the Ovule**: The ovule, also known as the megasporangium, is a small structure that is attached to the placenta.

3. **Role of Funicle**: The funicle serves as the stalk that connects the ovule to the placenta, facilitating the transfer of nutrients and support.

4. **Fusion Point**: The hilum is the point of fusion between the body of the ovule and the funicle. This junction is crucial for the ovule's attachment and stability.

5. **Integuments**: The ovule is surrounded by protective layers known as integuments. These layers help protect the developing embryo sac within the ovule.

6. **Diagram Reference**: When visualizing the ovule, it is helpful to refer to a diagram that shows the various parts, including the hilum, funicle, integuments, and the embryo sac.