Question

1. The process of fusion of a sperm with an ovum is called fertilisation. 2. During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes in the membrane. Regarding 1 and 2 :

Answer 1

1. When sperm dissovles hyaluronic acid .... it digests corona radiata .... and then enter into ovum by repturing zona Pellucida..... this is what known as fertilization .....
2. for second see attached photo