The process of sperm penetrating the ovum is mainly

Options

A. Mechanically
B. Chemically
C. Electrostatically
D. Thermally

Answer

To solve the question regarding how sperm penetrates the ovum, we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding the Process**: The question asks about the mechanism by which sperm penetrates the ovum. This involves understanding the interaction between the sperm and the ovum.

2. **Contact with the Ovum**: When sperm comes into contact with the ovum, a specific reaction occurs. This is the first step in the penetration process.

3. **Acrosomal Reaction**: The next step is the acrosomal reaction. This is a crucial event in fertilization where the sperm's acrosome (a cap-like structure) releases enzymes.

4. **Enzyme Release**: The enzymes released during the acrosomal reaction include hyaluronidase and acrosin. These enzymes play a key role in breaking down the barriers around the ovum.

5. **Dissolving Barriers**: The enzymes, particularly hyaluronidase, dissolve the actin filaments and other components of the zona pellucida (the protective layer surrounding the ovum). This enzymatic action is essential for the sperm to penetrate the ovum.

6. **Chemical Nature of the Process**: Since the process involves the release of enzymes and the breakdown of substances, it is classified as a chemical process.

7. **Conclusion**: Therefore, the correct answer to the question is that the process of sperm penetrating the ovum is mainly **chemical** in nature.

### Final Answer:
The process of sperm penetrating the ovum is mainly **chemical**.

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