Fertilization occurs in which structure?

• A. Fallopian Tube
• B. Vagina
• C. Uterus
• D. Ovary

Answer: (A)

Fertilization happens when a sperm and an egg unite, and this typically occurs in the fallopian tube, the duct that carries the egg from the ovary toward the uterus. Most often it happens in the ampulla, the wider section of the tube, where the sperm can penetrate the egg to form a zygote. After fertilization, the zygote travels to the uterus for implantation in the lining. The vagina is the passage for sperm entry but not the site of the egg–sperm fusion; the ovary releases the egg and is not where fertilization occurs; the uterus is where implantation and early embryonic development happen, not the moment of fertilization. Therefore, the fallopian tube is the correct site.