Given below are two columns. In Column I the names of four contraceptive devices are given and in Column II the modes of action of the contraceptives are given. Select the option where the contraceptive devices are correctly matched with their respective modes of action.

The correct option is P-ii, Q-iv, R-iii, S-i.

Based on the image provided, we can match the contraceptive devices listed in Column I with their corresponding modes of action listed in Column II by analyzing them step-by-step:

1. Lippes loop (P):
Lippes loop is a non-medicated Intrauterine Device (IUD). Its primary mode of action is to stimulate a local inflammatory response in the uterus, which attracts macrophages. This leads to the increased phagocytosis (destruction) of sperms within the uterus, preventing them from reaching the fallopian tubes.
Therefore, P matches with ii (Phagocytosis of sperms in uterus).

2. Multiload 375 (Q):
Multiload 375 is a copper-releasing IUD. The continuous release of copper ions inside the female reproductive tract acts as a spermicide, suppresses sperm motility, and alters the local environment, making the uterus and cervix hostile to sperms.
Therefore, Q matches with iv (Makes cervix hostile to sperms).

3. Subcutaneous Norplant (R):
Norplant is a subdermal implant consisting of small rods placed under the skin. It slowly and continuously releases synthetic progesterone (levonorgestrel) into the bloodstream. This hormone increases the viscosity and thickness of the cervical mucus, creating a barrier that prevents sperms from entering the uterine cavity.
Therefore, R matches with iii (Causes thickening of cervical mucous).

4. Saheli (S):
Saheli is a non-steroidal, once-a-week oral contraceptive pill containing centchroman. It works by interfering with the hormonal feedback loop, thereby inhibiting ovulation, and it also prevents the implantation of a fertilized ovum by modifying the endometrial lining.
Therefore, S matches with i (Inhibition of ovulation).

Combining these matches, we get:
P → ii, Q → iv, R → iii, S → i