The ovum in stroma of mammalian ovary is enclosed in a perforated membrane . It is

Options

A. Zona radiata
B. Zona pellucida
C. Vitelline membrane
D. Membrana granulosa

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure**: The question refers to the ovum in the stroma of the mammalian ovary. The stroma is the supportive tissue surrounding the ovum.

2. **Identifying the Layers**: The ovum itself is surrounded by specific layers:
- **Zona Pellucida**: A glycoprotein layer surrounding the ovum.
- **Corona Radiata**: A layer of granulosa cells that surrounds the zona pellucida.

3. **Clarifying the Context**: The question specifically mentions the "stroma" of the ovary, which includes the ovum and its surrounding structures. Therefore, we need to focus on what encloses the stroma rather than just the ovum.

4. **Examining the Options**: The options provided need to be analyzed:
- **Zonaradiata and Zona Pellucida**: These are specific to the ovum, not the stroma.
- **Vitaline Membrane**: This is a protective layer but does not form a membranous structure around the stroma.
- **Membrane Granulosa**: This is the correct option as it refers to the layer of granulosa cells that covers the stroma and protects it.

5. **Conclusion**: The correct answer is **Membrane Granulosa**, as it forms the protective layer around the stroma of the ovary.

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