NEETZoologyHuman Reproduction
How does a sperm enter into the cytoplasm of the ovum?
Options
- ABy inducing changes in the membrane that block the entry of additional sperms
- BBy the secretions of the acrosome
- CBy passing through the zona pellucida layer of the ovum
- DBy the formation of a diploid zygote
Correct answer
B. By the secretions of the acrosome
Step-by-step solution
During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum (Figure 2.10) and induces changes in the membrane that block the entry of additional sperms. Thus, it ensures that only one sperm can fertilise an ovum. The secretions of the acrosome help the sperm enter into the cytoplasm of the ovum through the zona pellucida .