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. the parietal placentation
B. the basal placentation
C. the marginal placentation
D. the axial placentation

Answer

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

### Step-by-Step Solution:

1. **Understand the Concept of Placentation**:
- Placentation refers to the arrangement of ovules within the ovary of a flower. It is important to know the different types of placentation to answer the question correctly.

2. **Analyze the Given Description**:
- The question states that the placenta forms a ridge along the ventral suture of the ovary and that the ovules are borne on this ridge in two rows. This specific arrangement is crucial for identifying the type of placentation.

3. **Identify the Options**:
- The options provided are:
- A) Parietal placentation
- B) Basal placentation
- C) Marginal placentation
- D) Axial placentation

4. **Relate the Description to the Options**:
- **Marginal Placentation**: In this type, the ovules are arranged along the ridge (ventral suture) of the ovary, forming two rows. This matches the description given in the question.
- **Parietal Placentation**: Here, ovules are attached to the walls of the ovary, not along a ridge.
- **Basal Placentation**: In this type, ovules are attached at the base of the ovary.
- **Axial Placentation**: This involves ovules attached along a central axis of a compound ovary.

5. **Conclude the Answer**:
- Based on the analysis, the correct type of placentation where the placenta forms a ridge along the ventral suture of the ovary, with ovules borne on this ridge in two rows, is **Marginal Placentation**.

### Final Answer:
The type of placentation is **Marginal Placentation**.