12th Class Biology Sample Paper Biology - Sample Paper-9

  • question_answer
    How is polyspermy prevented?

    Answer:

    An egg reacts rapidly to the entry of the sperms. First, the egg becomes activated and undergoes depolarization of its membrane. Second the egg exhibit cortical reaction & shows zona reactions. The plasma membrane is altered immediately to make the egg impervious to any other sperm.


You need to login to perform this action.
You will be redirected in 3 sec spinner