Statement A: Copper-T is an effective contraceptive device in human females.
Statement B: Copper-T acts as a barrier and prevents the passage of sperms from vagina upwards into fallopian tubes.

Intrauterine device (IUD) Copper- T is plastic or metal object placed in the uterus by a doctor. Copper- T prevents the fertilisation of the egg or implantation of the embryo. Their presence perhaps acts as a minor irritant and this makes the egg to move down the fallopian tubes and uterus rather quickly before fertilisation or implantation.