Read the following paragraph given.
Although spermatozoa are said to be 'mature' when they leave the epidi dymis, their activity is checked by multiple inhibitory factors secreted by the genital duct epithelium. Therefore when they are first expelled in the semen, they are unable to perform their duties in fertilizing ovum. Be fore fertilization they have to be activated.
a. How and from where the sperm gets activated?
b. Give an outline of the remaining process after activation.

Explanation

a. The sperm gets activated in the oviduct with the help of a process called capacitation
b. Spermatozoa penetrate the barriers of the egg membrane by releasing hyaluronidase which dissolves the egg membrane. Then the fusion of the male and female pronucleus occurs.