What is true about the process of fertilization?

Options

A. Only acrosome of sperms enters the egg
B. Two haploid nuclei fuse but the fusion nucleus divides immediately to form two haploid nuclei.
C. entry of sperm activates the egg to complete meiosis
D. Only one sperm enters an egg.

Answer

### Step-by-Step Solution:

1. **Understanding Fertilization**: Fertilization is the process where a sperm cell fuses with an egg cell (ovum) to form a zygote. This process typically occurs in the fallopian tubes after ovulation.

2. **Identifying the Options**:
- **Option A**: "Only acrosome of sperms enters the egg."
- This statement is incorrect because while the acrosome plays a crucial role in penetrating the egg's outer layer, the entire sperm cell (including its nucleus) enters the egg.
- **Option B**: "2 haploid nuclei fuse but the fusion nucleus divides immediately to form 2 haploid nuclei."
- This statement is also incorrect. During fertilization, the two haploid nuclei (from sperm and egg) fuse to form a diploid zygote nucleus, not two haploid nuclei.
- **Option C**: "Entry of sperms activates the egg to complete meiosis and only one sperm enters the egg."
- This statement is correct. The entry of a sperm activates the egg to complete its second meiotic division, and typically, only one sperm successfully fertilizes the egg.

3. **Conclusion**: Based on the analysis of the options, the correct statement about the process of fertilization is **Option C**: "Entry of sperms activates the egg to complete meiosis and only one sperm enters the egg."