unilocular and ovules are on two vertical rows on ventral sutures is called

Options

A. Marginal placentation
B. Parietal placentation
C. Superficial placentation
D. Basal placentation

Answer

To solve the question regarding the term that describes unilocular and ovules arranged in two vertical rows on ventral sutures, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms**:
- **Unilocular**: This refers to a structure that has a single chamber or locule.
- **Ovules**: These are the structures within the ovary that develop into seeds after fertilization.
- **Ventral Suture**: This is the line of fusion on the side of the ovary where the ovules are attached.

2. **Identify the Placenta Types**:
- The question provides four options related to placentation:
- **Marginal placentation**
- **Parietal placentation**
- **Superficial placentation**
- **Basal placentation**

3. **Analyze Each Option**:
- **Marginal Placenta**: This type occurs when ovules are attached along the edge or margin of the ovary, which aligns with the description of being on the ventral suture.
- **Parietal Placenta**: In this type, ovules are attached to the walls of the ovary, not specifically on the margins.
- **Superficial Placenta**: This type refers to ovules attached to the inner surface of the ovary, not in vertical rows.
- **Basal Placenta**: This type has ovules attached at the base of the ovary.

4. **Select the Correct Answer**:
- Based on the definitions and descriptions, **marginal placentation** is the correct term for unilocular and ovules arranged in two vertical rows on the ventral sutures.

5. **Conclusion**:
- Therefore, the answer to the question is **marginal placentation**.