When placenta forms a ridge along the ventral suture of the ovary and the ovules are borne on this ridge forming two rows, the placentation is termed as

Options

A. marginal
B. axile
C. parietal
D. free central

Answer

To solve the question regarding the type of placentation where the placenta forms a ridge along the ventral suture of the ovary and the ovules are borne on this ridge forming two rows, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question describes a specific arrangement of ovules within the ovary. We need to identify the term used for this type of placentation.

2. **Visualize the Ovary**: Imagine or sketch the ovary of a flower. The ovary has a ventral suture, which is the line where the two halves of the ovary meet.

3. **Identify Placenta Formation**: According to the question, the placenta forms a ridge along the ventral suture. This means that the placenta is not spread out but instead is concentrated along this line.

4. **Placement of Ovules**: The question states that the ovules are borne on this ridge, forming two rows. This is a key characteristic that helps differentiate this type of placentation from others.

5. **Consider the Options**:
- **Marginal**: This type of placentation has ovules arranged along the margin of the ovary, forming a ridge.
- **Axial**: In axial placentation, the ovules are arranged around a central axis, not along a ridge.
- **Parietal**: Here, the ovules are attached to the walls of the ovary, not specifically along a ridge.
- **Free Central**: In this type, the ovules are located at the center of the ovary without any partitions.

6. **Conclusion**: Based on the description provided in the question, the type of placentation where the placenta forms a ridge along the ventral suture and the ovules are borne in two rows is termed **Marginal placentation**.

### Final Answer:
The placentation is termed as **Marginal**.

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