The non-cellular layer of the mature ovum is

Options

A. Corona radiata
B. Zona pellucida
C. Theca interna
D. Granulosa

Answer

To solve the question regarding the non-cellular layer of the mature ovum, we will analyze the given options step by step.

### Step-by-Step Solution:

1. **Understanding the Question**:
- We need to identify the non-cellular layer surrounding the mature ovum (female gamete).

2. **Analyzing the Options**:
- **Option A: Corona Radiata**:
- This is the outermost layer surrounding the ovum. However, it is made up of cells (granulosa cells), so it is not a non-cellular layer.
- **Option B: Zona Pellucida**:
- This layer is located just beneath the corona radiata. It is a non-cellular layer composed of glycoproteins, which provides protection and plays a role in fertilization.
- **Option C: Theca Interna**:
- This layer surrounds the primary oocyte and is cellular in nature. Thus, it is not the correct answer.
- **Option D: Granulosa**:
- This layer consists of multiple layers of cells that surround the ovarian follicle. Therefore, it is also not a non-cellular layer.

3. **Identifying the Correct Answer**:
- Based on the analysis, the only option that is a non-cellular layer is **Option B: Zona Pellucida**.

### Final Answer:
The non-cellular layer of the mature ovum is **Zona Pellucida**.

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