Which of the following is/are correct?
(1) Pill prevents ovulation
(2) Vasectomy causes semen having no sperms
(3) Copper - T prevents implantation
(4) All of the above
(a) is correct because pills inhibit ovulation and implantation as well as alter the quality of cervical mucus to prevent or retard entry of sperms.
(b) is correct because in vasectomy, a small part of the vas deferens is removed or tied up through a small incision on the scrotum. This blocks sperm transport and thus conception.
(c) is correct as IUDs increase phagocytosis of sperms within the uterus and the Cu ions released suppress sperm motility and the fertilising capacity of sperms, make the uterus unsuitable for implantation and the cervix hostile to the sperms.