| Column-I | Column-II | ||
| A. | Transfer of sperms into the female genital tract | P. | Fertilisation |
| B. | Embryonic development | Q. | Insemination |
| C. | Attachment of blastocyst to the uterine wall | R. | Gestation |
| D. | Fusion of male and female gametes | S. | Implantation |
| A | B | C | D | |
| 1. | P | Q | R | S |
| 2. | R | Q | S | p |
| 3. | Q | R | S | P |
| 4. | S | P | R | Q |