The acrosome plays a role in :-

Options

A. Fusion of nuclei of gametes
B. Motality of sperm
C. Penetration of sperm into ovum
D. All of the above

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure of Sperm:**
- The sperm consists of several parts: the head, neck, middle piece, and tail.
- The head of the sperm contains the nucleus and is capped by a structure known as the acrosome.

2. **Identifying the Role of the Acrosome:**
- The acrosome is a cap-like structure that contains enzymes.
- These enzymes are crucial for the fertilization process as they help the sperm penetrate the outer layers of the ovum (egg).

3. **Mechanism of Action During Fertilization:**
- When a sperm reaches the ovum, the enzymes released from the acrosome facilitate the breakdown of the zona pellucida, which is the protective layer surrounding the ovum.
- This penetration is vital for the sperm to enter the cytoplasm of the ovum.

4. **Preventing Polyspermy:**
- Once a sperm penetrates the ovum, changes occur in the ovum's membrane, which prevents additional sperm from entering. This process is known as blocking polyspermy, ensuring that only one sperm fertilizes the ovum.

5. **Conclusion:**
- Therefore, the primary role of the acrosome is to assist in the penetration of the sperm into the ovum.

**Final Answer:**
The acrosome plays a role in the penetration of sperm into the ovum.

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