Head of sperm contains

Options

A. Nucleus having diploid set of chromosomes
B. Nucleus having haploid set of chromosomes
C. Nucleus and mitochondria
D. Mitochondria and acrosome

Answer

### Step-by-Step Solution:

1. **Understanding the Structure of Sperm**:
- The sperm is the male gamete and is always haploid in nature, meaning it contains one set of chromosomes (N).

2. **Identifying the Regions of Sperm**:
- The sperm has three main parts: the head, the middle piece, and the tail.
- The head contains two important components: the acrosome and the nucleus.

3. **Components of the Head**:
- **Acrosome**: Located at the tip of the head, it contains acrosomal enzymes that are crucial for penetrating the egg's protective layers during fertilization.
- **Nucleus**: The nucleus is elongated and contains the haploid set of chromosomes (N). This is where the genetic material is stored.

4. **Clarifying Misconceptions**:
- The head does not contain mitochondria; mitochondria are found in the middle piece of the sperm, which provides energy for motility.
- The neck region contains the centriole, which is also not part of the head.

5. **Evaluating the Options**:
- Option 1: Nucleus with a diploid set of chromosomes - Incorrect (sperm is haploid).
- Option 2: Nucleus with a haploid set of chromosomes - Correct (this is what is present in the head).
- Option 3: Nucleus and mitochondria - Incorrect (mitochondria are in the middle piece).
- Option 4: Mitochondria and acrosome - Incorrect (acrosome is in the head, mitochondria are in the middle piece).

6. **Conclusion**:
- The correct answer is that the head of the sperm contains the nucleus with a haploid set of chromosomes.