Fertilization membrane in ovum prevents

Options

A. Meiosis - II
B. polyspermy
C. Meiosis - I
D. phase of Multiplication

Answer

**Step-by-step Solution:**

1. **Understanding Fertilization Membrane**: The fertilization membrane is a protective layer that forms around the ovum (egg) after fertilization occurs. It is also known as the vitaline membrane.

2. **Formation of Zygote**: When a sperm successfully fuses with the ovum, it creates a zygote, which is a diploid cell (2N). This fusion is the initial step in the fertilization process.

3. **Role of the Fertilization Membrane**: After the fusion of the sperm and ovum, the fertilization membrane forms to prevent additional sperm from entering the ovum. This is crucial because if multiple sperm were to fuse with the ovum, it could lead to a condition known as polyspermy.

4. **Polyspermy**: Polyspermy is a situation where more than one sperm fertilizes an ovum. This is undesirable as it can result in an abnormal number of chromosomes in the resulting zygote, leading to developmental issues.

5. **Conclusion**: The primary function of the fertilization membrane is to prevent polyspermy, ensuring that only one sperm can fertilize the ovum.

**Final Answer**: The fertilization membrane in the ovum prevents polyspermy.

---