Which among the following statements is correct to indicate the difference between sperm and egg

Options

A. Cytoplasm in sperm is more abundant than in egg
B. Accessory membranes are absent in sperm but present in egg
C. Nucleus is clear in sperm and very compact in egg
D. Mitochondria forms a sheath in egg and diffused in sperm.

Answer

To determine the correct statement that indicates the difference between sperm and egg, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding the Gametes**:
- Sperm is the male gamete, which is motile and haploid.
- Egg (or ovum) is the female gamete, which is non-motile and also haploid.

2. **Analyzing Each Option**:
- **Option A**: "Cytoplasm in sperm is more abundant than in egg."
- This statement is incorrect. The egg has a larger volume of cytoplasm compared to the sperm, which is relatively small and streamlined for mobility.

- **Option B**: "Essential membranes are absent in sperm but present in egg."
- This statement is correct. The egg has an outer covering known as the zona pellucida, which is absent in sperm. The sperm has a plasma membrane but lacks the additional protective layers found in the egg.

- **Option C**: "Nucleus is clear in sperm but very compact in egg."
- This statement is misleading. The nucleus in sperm is dense due to coiled chromatin, while the nucleus in the egg is typically larger and less compact.

- **Option D**: "Mitochondria forms a sheath in egg and diffused in sperm."
- This statement is incorrect. In sperm, mitochondria are concentrated in the midpiece to provide energy for movement, while in the egg, they are distributed throughout the cytoplasm.

3. **Conclusion**:
- The correct answer is **Option B**: "Essential membranes are absent in sperm but present in egg."