question_answer 22)

    Choose the incorrect statement from the following (a) in birds and mammals internal fertilization takes place (b)colostrum contains antibodies and nutrients (c) polyspermy is prevented by the chemical changes in the egg surface (d) in the human female implantation occurs almost seven clays after fertilization

Answer:

                      (c)Polyspermy describes on egg that has been fertilized by more than one sperm. During Fertilization, binding of the sperm to the egg induces depolarization of the egg plasma membrane that block the entry of additional sperms. Rest all statements are correct.