| List I | List II |
| (A). Vaults | (I). Entry of sperm through cervix is blocked. |
| (B). IUDs | (II). Blockage of vas deferens |
| (C). Vasectomy | (III). Phagocytosis of sperms within the uterus |
| (D). Tubectomy | (IV). Blockage of fallopian tube |
| List I (Contraceptive aids.) | List II (Mode of action.) |
|---|---|
| (A). Lippes loop | (I). Make the uterus unsuitable for implantation and cervix hostile to the sperms. |
| (B). Cu-T | (II). Attracts the macrophages which increase phagocytosis of sperms. |
| (C). LNG-20 | (III). Blocks the entry of sperms through the cervix. |
| (D). Vaults | (IV). Suppress sperm mobility and fertilizing capacity of sperms. |