KCET 2015 Biology Solved Paper

Intrauterine Contraceptive Devices (IUDs) are effective and popular methods of contraception. These are inserted by doctors or expert nurses in the uterus through vagina. These devices are presently available as the non-medicated IUDs(e.g., Lippes loop), copper releasing IUDs(CuT, Cu7. Multiload 375) and the hormone releasing IUDs (Progestasert, LNG-20). IUDs increase phagocytosis of sperms within the uterus and the Cu ions released suppress sperm motility and the fertilizing capacity of sperms. The hormone releasing IUDs make the uterus unsuitable for implantation and the cervix hostile to the sperms. IUDs are ideal contraceptives for the females.