Question

How is the entry of only one sperm and not many ensured into an ovum during fertilisation in humans?​

Answer 1

Explanation:

During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and with the help of acrosomal secretions induces changes in the membrane that block the entry of additional sperms. Thus, it ensures that only one sperm can fertilise an ovum.

Answer 2

Answer:

During fertilization in humans, once the sperm comes in contact with ovum it depolarises the zona pellucida layer of ovum and also the fusion of cortical granule containing an enzyme with zona pellucida layer takes place which in turn blocks the entry of other sperms.

Explanation: