The anterior portion of the sperm head which is covered by a cap-like structure is called:

Options

A. Acrosome
B. Antrum
C. Sertoli cells
D. Enzymes.

Answer

To solve the question regarding the anterior portion of the sperm head that is covered by a cap-like structure, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Sperm**:
- The sperm cell has a head, midpiece, and tail. The head contains genetic material and is crucial for fertilization.

2. **Identify the Cap-like Structure**:
- The question specifies a cap-like structure on the anterior portion of the sperm head.

3. **Recall Relevant Terminology**:
- In sperm biology, the term "acrosome" refers to a specialized structure that covers the anterior part of the sperm head.

4. **Define the Acrosome**:
- The acrosome is an organelle that develops from the Golgi apparatus and is essential for the sperm's ability to penetrate the egg during fertilization.

5. **Consider the Options Provided**:
- A. Acrosome
- B. Entrum
- C. Certilized cells
- D. Enzymes

6. **Select the Correct Answer**:
- Based on the definition and understanding of the acrosome, the correct answer is option A. Acrosome.

### Final Answer:
The anterior portion of the sperm head which is covered by a cap-like structure is called the **Acrosome** (Option A).

---