Where do ovum and sperm join to form a zygote?

• A. Distal fallopian tube
• B. Uterine cavity
• C. Ovary
• D. Endometrium

Answer: (A)

Fertilization occurs where the egg and sperm meet in the fallopian tube, most often in the ampulla, the distal portion nearest the ovary. That’s the site where the ovum released from the ovary and sperm traveling through the female reproductive tract encounter each other and form a zygote. After fertilization, the zygote moves toward the uterus to implant into the endometrium.

The other options don’t fit because the uterine cavity is where implantation occurs, not the meeting point of sperm and egg; the ovary releases the ovum but is not where fertilization happens; and the endometrium is the uterine lining that the zygote implants into after fertilization.